Normal heart rate for a kitten is pretty fast 200-260 beats per minute. Check it by putting your ear on her and count them for 15 seconds, then multiply that number by 4. You could also count by feeling with your hand. If you are feeling unsure or worried, get a vet check. Go with your gut feeling. Good luck and keep us posted.
catinfo.org Since you are a first timer. This site is wonderful. Also, clean her teeth at minimum weekly. Clean teeth is one of the most important things for your cat, that and what you are feeding. Try not to buy any food you can get at the grocery store.