Double stamping the used cymbal and use earplugs comments. If I’d been smarter when I was starting out I’d be able to hear better now and would have a little more cash in my wallet. But regardless, buy the best cymbals you can buy with your budget. For sabian - which is what I play - do not buy below their AAX line and for zildjian - don’t go below K line. And if you can go hit some used cymbals in a shop or even Guitar Center. Sometimes you’ll find a no-name or very old cymbal that looks like shit but sounds great. The one thing I disagree with JJ on, which is very rare, is don’t polish your cymbals… Be proud of that sweet, sweet patina. The time you’ll spend polishing she could be practicing! Final cymbals comment, for starters you might also look for a cymbal set - hats, crash and ride are all you need - and they often go on sale new. I also recommend finding the set she wants and look for a gently used one but if you go that route I wouldn’t buy from an individual. A used gear shop or drum shop will do a little quality control and they’ll be much more expert at shipping which for a layman is a huge pain in the ass to do. Also, watch some videos on drum tuning (especially snare). There is an art to it and it takes a lot of playing around to dial in your sound.