Lol! I hate it when my bettas don't use stuff I put in for them.. I spend hours looking for caves they can hide in and explore and they just go stare at it and swim away. Only once have I had a betta use his cave when I was around XD I hope she uses it for you!
Lol! Lucky you XD
I bought a sunken ship for my girls and a mini one for one of my boys, he never uses it! The girls use theirs but he never does.. So I gave the ship to another betta, he didn't use it either.. And it went on.. Till one guy swam through it once and I was like fine its yours and gave little yellow mugs to the rest.. Well guess what? They love the stupid yellow mugs! -__-