My dog's bid for freedom

[Lact8]

We have a 3 year old Jack Russell.

Our garden is approx 150 foot long and we have a dog flap so she has always been free to come in and out as she wants.

We have spent ages dog proofing the boundaries so she can't get out but she has now started to scale 6 foot fences!!

Any ideas how I can stop her?

She doesn't appear to be able to climb brick walls (yet) but I can't afford to build a wall around the entire garden

I'm having to lock the flap and she's not happy being confined to the house but I have a 2 yr old and a 6 mth baby and its really stressful to round them up, shoes on, in the pram etc, grab the lead, walk the streets searching for her every time she escapes.

TIA

Anyone? Have a very unhappy dog here

Is my dog's climbing ability really this unique?? Should I get her a glittery collar and start selling tickets then?!

Only thing I can think is the wooden things you put at the top of fences at an angle facing into the garden. Like trellis but at an angle and may stop the dog getting over the fence?

what about the spike strips that you can get to put along the top of fences to deter cats?

Thanks, I'll be going to diy place at the weekend to see what they've got. Might combine the two to really try to deter her