Star wasn't responding very well to my feet so my trainer told me to get some spurs.
Granted, we are not seeing you in person like your trainer is, but I am not so sure that I agree with this.
The real purpose of spurs is to be able to be lighter with your cues, and make more advanced cues .... not to be "harsher" so a horse will pay attention to you.
If you need Star to be more responsive to your leg and seat cues, that's something you can work on. Very much in the same way that you try to make a horse soft to the bit. You wouldn't jump up into a harsher bit if your horse was "not responding well" to your current bit, right? You would work on making your horse more soft to that cue. Same should go for your legs/seat cues. At least, that's what I think.
Star may respond more briskly to you with spurs ... but if you do not change anything about the way you cue her, she could eventually become dull to that too. Remember to what your timing and your feel!
Also going to buy or get bit guards from my trainer also. I have a curb chain on my bridle but that does absolutely nothing with keeping the bit from sliding through Star's mouth.
Agree with the other poster. Bit guards will NOT keep a bit from pulling through a horse's mouth. They are purely to prevent a horse's skin from getting pinched in a bit that has a mouthpiece that slides (a bit with gag action).
What bit are you using now? Can you post a picture?
If the bit is sliding through her mouth on a regular basis, you are PULLING too much.