Any Experience with Instagram Paid Ads

My wife is fitness model and we are building her IG. Currently it has 115K followers and she has a few small sponsors. Has paid post for $1100 over the next 3 weeks. We want to grow her followers. If I convert her page to a business page and spend $1000 what kind of results would I expect.

Her IG is Aleksandraprice1989

Thanks for any input