Cooked...(help)

Hey guys , (16m 16f) Il in long distance relations-presse since last september now . Me and my gf were not always availible for some calls on the day So since october we are carlingue each other from like 11pm to 2 am Everything was good . Till my mom caught me talking to her yesterday . What do i do? She's going to check the phone bill to see the call durations(we sometimes called more than 5 hours) Im scared to be punished of not talking to her.. Do you think there is still a way for me to survive this ? Thanks ..