Op you are getting some stick you don’t deserve.
You have 2 young kids and they sound happy and fed (and changed lol) please be proud of what you are doing for them.
Regardless of when/ why etc - we are where we are.
My automatic thought was SEN so just park that rather than dismiss it.
I think you need to (before starting) decide on how this is all going to work, toilet or potty? Chocolate for what exactly? What if it’s a sit on the toilet but nothing, chocolate then? Bear in mind on the toilet you won’t ’see’ a wee.
I would also dedicate a period of time to do this so you’re not having to put a nappy back on to do a long train journey for example in the middle of training her.
ideally days in the garden playing so accidents are less of an issue.
I wonder if a sticker chart ‘inside’ the bathroom would encourage her to get to the toilet/ potty? I would keep the potty in the bathroom with the toilet to teach her the potty isn’t always in the same room as she will need to learn to ‘travel’ to the toilet wherever she is.
Please don’t pressure yourself or her. Don’t see it as a countdown with a ticking clock or this could hinder your feelings and her progress.
Make it fun, a bit like a game and use something she likes to help (bribe 🤣) her.
Worse case scenario is she’s not fully trained when going to school- whilst this isn’t ideal it’s not worth loosing your mind over in the next 6 weeks.
FWIW my dd trained in 1 day aged 2 and 1 month (she was ready as she used to say ‘doing wee wee’ in the couple of weeks before starting where I’d praise her for doing that wee even though it was in the nappy - she was learning the feeling which was great. She took longer for overnight which was nearer 3.
Aged about 3.5-4 she then had accidents in bed EVERY night and I didn’t know why. It was a pain as she’d have to get up, washed, bedding changed- nightmare! Then this stopped as quick as it started. I didn’t make a big deal of any of this and it was never really spoke about until months and months later when she said she would wake up needing a wee and she didn’t want to call me or getup so she just did it in bed and went back to sleep! 😱 I say this because sometimes kids just don’t care about feeling wet so we need to get their buy in in a different way!
Good luck- get yourself some treats too 😉