Yes, multiple ultrasounds, bloodwork, xrays etc. when she was 4 and when she was 5 1/2. I tried for about 6 months to just leave her alone about it, talk about it like you mentioned is something I always do. She saw a therapist who has alot of experience with this stuff and also did Parent Child Interaction Therapy and nothing worked, the therapist just said there isn't anything more she can do.
Has she ever been tested for any problems with her bladder? Maybe she cannot feel herself having to use the bathroom thus therefore not able to have the ability to know of when to use the bathroom. She probably gets embarrassed to have someone constantly remind her to use the bathroom. It probably feels degrading to her. She probably feels like she's being treated like a baby. Have you ever spoken to her about how she feels about the whole situation? Talk to her and include her in the decisions of her options. Have you maybe tried getting her a watch that she'd wear everyday to remind her when to use the bathroom? I don't know where you'd get a watch that would have multiple time settings. It could be expensive though.I'm thinking that maybe she has a small bladder or a weak bladder and can't win for losing on this issue. Has she ever seen a urologist? I believe that these types of doctors deal with bladder problems. I hope this helps you out. Other than that, all I can think of is that you're going to have to re-train her and it'll be hard because she will resist as you already know. Good Luck