Use a Waterproof, bed-pad DIRECTLY under her when she sleeps.
I do that with my kids, who are 4 and 8.
Then, if soiled, I do NOT have to wash the entire bedding or sheets. ONLY the bed pad.
I got mine from Amazon, ever since my Daughter was a Toddler. I have SEVERAL. That I rotate as needed.
Easy.
Pull-ups, leaks. It does not hold much.
Use regular diapers or night time diapers.
Also, you may need to change her one time a night. Bigger/older kids, do By nature, have more pee quantity. Not baby sized quantity. It is relative to their age, per output.
My son, uses size 6 or 7 diapers. He is a big tall boy, who is about that same weight. It fits him fine. Huggies or Pampers.
Some kids bed wet later.
Night time dryness, is not something biologically attained, until 7 years old. Some kids later. My Husband was wetting the bed, even older than 7, for example. When he was a kid.
Is she a DEEP sleeper????