AIBU to think I have no liability here? (diagram attached)

I was going to suggest to see what google maps says? Can you get a clearer picture than the one above and are there any markings?? There are a load of roundabouts not far from me like this. She was completely in the wrong

here's a picture for those incorrectly saying you should have moved over to the left hand lane to take your exit

That's not what the highway code says at all in your link:

"When taking any intermediate exit, unless signs or markings indicate otherwise

• select the appropriate lane on approach to the roundabout
• you should not normally need to signal on approach
• stay in this lane until you need to alter course to exit the roundabout
• signal left after you have passed the exit before the one you want."

(Althouhg as it happens, in this case, straight on isn't an intermediate exit, its the second and only other exit before going back around the roundabout to where you joined)

Her fault as she shouldn’t have turned right but you should have checked the lane was clear before exiting. Probably be 50/50

I failed my first test for expecting someone to do something they signalled and were in the correct lane for. I was at a T junction with an exit right and left, I was going left, the car approaching from my right indicated to turn left (into the turning I was coming out of), they were in the left lane clearly marked left turn with a big arrow on the floor, so I pulled out before they'd fully turned (lots of traffic I'd sat there a while worried about failing for undue hesitation). Despite indicating left and being in the turn left lane they carried on straight ahead and I had to emergency stop to stop crashing into the front side of them, I failed because despite what people should do and indicate to do i should've left enough time to make sure they were actually turning.
I think on that basis your insurance will go 50/50 as you should've made sure of what she was doing before crossing her lane

This is why, in that situation, I always take the near side lane, (Green). Occasionally I’ve had drivers do that.

it's not just her mistake though @WiggyClawsThe2nd

The road markings, or lack of, make very little difference to culpability here. The OP tried to exit a junction that wasn't clear and it was the OP who hit the other car, not the other way around.

She was totally wrong. In the wrong lane.

There is no turning right! There is only left, straight on, or all the way round. Why on earth would there be a right hand lane purely for the handful of people who've taken a wrong turn and need to go all the way around a roundabout?!?

Turning right, going all the way round. Only straight over if there are road marking

But its not a 4 exit round about. There is a left turn, straight on, or back the way you came.

How utterly annoying - she is clearly in the wrong and the smooth functioning of that junction is based on using the lane corresponding to where you are going at roundabout 2. But I also think insurance company will pull the ' you are supposed to be aware enough to be able to avoid a collision if another road user does something unexpected'.

And I hate to say it even if you manage to protect your no claims think they'll still put your premiums up for having been involved in an accident which always seems monumentally unfair.

This. 1st or 2nd exit in a 4 exit roundabout would be left lane. 3rd or back round to the 4th, the one you entered from, right lane.

If you describe it to the insurer the way you've described it here, you'll be liable.

I agree. I expect it’ll be judged 50/50.

It was both your mistake unless the road markings indicate otherwise!!!

I'm quite worried that about the possiblity of the people saying you were in the wrong lane having driving licenses tbh... What on earth they think the right hand lane is for is beyond me.

https://www.highwaycodeuk.co.uk/roundabouts.html

Nope. Left hand lane for straight on unless road markings indicate different.

If there was no contrary lane markings BOTH drivers were in the wrong lane.

50/50

If there are no markings to say otherwise you should have been in the left on approach to go straight ahead. She was completely wrong though.

You were both in wrong lane. You should not be discussing it with her. Leave it up to the insurance company.

So you hit her rather than her hitting you. It'll certainly be a 50/50 fault then.

Ignore people who say you should have been in left hand lane. Without markings you are free to use either lane for straight over.

Yeah those impact zones are going to be messy. Have you had her version of events yet?

I'm sorry about your crash and your car being written off, but I think it'll go 50/50.

She was in the wrong lane but you were still crossing her lane to exit the roundabout. If you couldn't get into her lane safely - because her car was in it - you should have gone round the roundabout again. She had right of way in the outermost lane, because she was already in it. If there's traffic in the outermost lane you don't have an exit route so you go round again. Her mistake in lanes doesn't trump her right of way.