Over spring break I spent it with one of my other friends and when my other friend found out about it she started being mean to me just because I spent spring break with somebody else so I don't know if she is my is my friend or not oh and also the two friends don't get along together

So what's your question? It's pretty tough for any of us to know if she is your friend or not. So why don't you... oh, I don't know... maybe try asking her?

Yes middle school is silly, people get so upset over things that mean so little in 20 years.
But was she your friend , yes, is she jealous , most likely,

She does not like other person, and that puts you in the middle. At times you can not be good friends with two people who do'n't like each other and have to chose one.