What should I get for my Mom?

Okay... So lately my mom has been a little stressed out between work, driving my brother to his job, not being able to sleep so well, and my Dad going on business trips. So she'll get kind of mad sometimes and I try to be nice but not say to much because I don't want to make her to upset. Sometimes she thinks we don't care. But then the next morning she's all good. I'm really connected to my mom and I love her and I really wanna show her that I care. I bought her a cheap little shower/bath kit already but it was only 3 dollars. I really wanna get her something else that won't really "run out" such as a ring rather then a shampoo ya know? Please keep in mind that im 13, so I don't have a whole lot of money but she loves old things, biking, swimming, necklaces, bracelets, she doesn't really like animals or makeup but you get the point... Any suggestions? :D