:)
I can only swear that it’s not my Ipad and that I am telling the complete truth.
You should ask her to think if that may have happened, and if so, she may be able to remember what pin code she used. Think about birthdays or other numbers she may have used. 0000 and 1234 are very common. Hopefully, you can figure it out. If you can't figure it out, read this:
https://support.apple.com/en-us/HT204306