@sunisbetterthanrain I'm sorry you aren't seeing any improvements yet. I'm sure you will but when your daughter is ready.
DS did a urine sample today, showing no concerns. GP did some general tests along with a stomach examination. Also did a diabetes test via finger prick (not pleasant) nothing, but reassuring.
My son can be constipated which I also mentioned, the GP has suggested laxatives as the bowel can press on the bladder causing dribbles so to speak. Will give that a go see what happens.
However, I made a toilet chart on the promise of 7 days dry he can chose a super suit dress up costume (one in particular he has had his eye on, so I've purchased from Marketplace) and today has had a fully dry day!! 
All we can do is persevere and hope for the best, I know how frustrating it can be, more so because we know they can do it. I think DS is just being lazy because he is too lazy/ doesn't want to leave toys for fear someone will take them a preschool.
I saw a few parents of older children in preschool (4ish) being handing the dreaded carrier bag of wet clothes so we aren't alone. I think I worry too much about what other people think at times but then have to remind myself he's only been on this plant 3 years, in that time he's learnt to walk, talk, count etc he isn't doing bad and he will get it, the same for your daughter.
💐