Should i call her? what should i do?

i called a girl that i like for the first time the other day she answered and we talked for half an hour. my friend called her from my phone the next day and she missed the call. she called me later that night to get back to me and ask what i needed to tell her. i told her it was my friend that called her and not me. i thought she was gonna hang up after that but she started talking to me and we ended up talking for an hour and the conversation was more easy and relaxed than the first time. i was wondering if i should call her again or if that would seem weird or annoying. what should i do?