Indoor sports are difficult. I swear they put 30 watt bulbs in most gyms. If you want truly "professional" results you will need to spend a small fortune. That's why pros make the money they do; they need to afford all that fast glass. Many of them don't even own the lenses they use. One possibility is lensrentals.com where you might be able to get a loan of some of the better lenses out there.
But, face facts. You're not a professional sports shooter. Your goal in capturing these events is documentary, not selling the images to news outlets or glossy magazines. You have already done that with the images you've made. If you want less blur, crank up the ISO. Does it really matter if the images have lots of noise in them? Let me repeat that. Does it
really matter if the images have lots of noise in them? Do you need to see her individual eyelashes in every shot? What we often face is the fact that we can not live up to the "standards" of professionals. Who cares? My wife's not a super-skinny model. Yet I do nudes of her. I like 'em. She's not a model, I'm not a model photographer, and we get along just fine.
Your shots are darn nice for a non-pro. Crank up the ISO and enjoy the action, don't waste your life fretting over expensive standards.
Disclaimer: if you're filthy rich, by all means, get the best gear. Makes life easier.