I don't know if it is different for girls, but with boys, there is a hormone they release that stops them bedwetting around age 3. If the hormone is not released then, it won't happen until puberty. This happened to one of my sons. We just had to wait until puberty kicked in, the hormone was released and he got dry, around age 10, I think. It's worth ruling out other reasons, such as infection or underlying illness but if she is a very frequent bedwetter, it may be this hormonal delay.
We tried everything. Night lifting, reducing evening drinks. Nothing worked. One GP said the issue is that his bladder control is too strong and only relaxes when he sleeps. You could encourage her to drink a lot at breakfast and during school hours and let teachers know that she needs to be excused quickly if she wants the loo, to help train her muscles to relax during the day.
Avoid dark juice drinks like blackcurrant and look up any other diuretic foods and drink, and avoid them from afternoon onwards.
For DS, we did go back to pull ups. I also put dry-nite adhesive mats on his sheet and also the underside of his duvet, where it touched his body when he slept as washing a drying a duvet every night just became too much. If there's an accident, just pull off the absorbent mats. I also used to double up sheets so there would be: mattress protector, sheet with absorbent adhesive mat, second sheet, second adhesive mat, duvet with adhesive mat attached where it is most likely to get wet. Then if he had an accident in the night I just had to pull off the top sheet and there was clean bedding underneath. I always kept wipes and clean PJs beside his bed.
The washloads were exhausting - I remember that now.
For sleepovers and camps, we let parents know in advance, went for slim fit pull ups under baggy PJs and also used Desmopressin. I didn't like that drug so we only used it very seldom but he needed it on school camps, to avoid being teased or bullied.
She will grow out of it, but may not for a while. If she starts getting upset about it, maybe look at some of comedian Sarah Silverman's material. She's very honest about being a bedwetter throughout her childhood, and might be a good role model for feeling confident and unashamed. (Not sure how suitable she would be for a 6-year old.)