I am just curious how much it is. I know where I live things are inflated due to high rents for the studios or gym warehouse. Is it $500 a month or $2000 a month for gymnastics in your town (I really do not know.)? If it is lower, can she do fundraisers?
I know my kids are priced out for many activities even though they have a natural ability, because I can not afford it. Some moms have taken on a job or second job to pay for these expensive activities.
You are right there are sponsors, but I am not sure why they would sponsor an 8 year old unless she has a big youtube (or similar) following. The sponsors usually give money to get money.
Does you gym have ideas? She is so young that if the goal is to get a college scholarship (obviously no guarantee she will get one) they may say she could take more hours and not be on team (traveling/uniforms) until she is older. I do not know if this is something they would say, but a local coach you have a relationship with may be able to give you local advice. From experience I have seen the highest paying students get the most attention from owners of gyms. I know it might sound unfair, but I can see why an owner would want to pay attention to someone paying $2k a month vs $500 a month. I am not saying this to hurt your feelings, rather to relate.