Dd2 is 3.5
She is still in nappies. I cannot manage to potty/toilet train her at all 
She has EDS so has a lot of pain/dislocations/severe constipation (on movicol) so I think she is 'preoccupied' and unable to focus.
She also has type 1 diabetes and has daily hypos and is often exhausted due to both conditions.
Still wet at night.
Dd2 is really bright and understands the concept but just can't seem to concentrate due to pain/illness. Being in nappies/blood sugar issues keeps causing thrush so it would be preferable for her to be trained but we can't manage it.
Do I just need to wait a bit longer and put up with recurrent thrush etc or persevere with what so far isn't working and is just stressing her?
Ds1 had issues similar to this but was using toilet a bit earlier (has eds but not (t1 D or pain as severe).
I know she could do it but feeling less than 100 percent is stopping her. She leaks through nappies/pull ups now and I just don't know what to do. She is ready mentally but not physically I think or is there a way I could manage to toilet train her?