Is my friend jealous of me?

Okay so my best friend Kayla is really competitive. Once i started playing guitar she said she wanted to play drums, then she said she wanted to play keyboard, so then she got a keyboard and she started telling everybody at school that she's going to start taking lessons and if they knew that playing keyboard highers your test grades. Also once in choir we sang a duet and after wards people complimented me, and Kayla was right next to me and she got mad. And sometimes people will compliment on my clothes and if Kayla is around she'll say "I helped her pick that out" or if she has the same shirt like it she'll say "I have the same shirt why don't you ever tell me anything!!" And just recently I got a shirt and cute socks and shoes for school already because my parents don't like going at the last week because it's really busy and stuff. Okay and so last week she came over to my house and I showed her the stuff I got and she got mad and said "Ugh you get everything". I wasn't trying to rub it in her face I just wanted to show her the stuff I got. And + when she gets something new she always rubs it in my face. And she has called me fat, dumb, stupid and slow ;(. By the way I'm sorry this is long.