breaking Muslim Friendships permissible?

I have a best friend.(same gender)who loves me so much. and I'm the only muslim friend she has. but every single day we spend total 4 hours chatting about halal but past, childhood and other things . (never gossip). sometimes also learn quran together. our frendship brings good and bad to our akhira. soemtimes one weighs over another. and she doesn't seem to be guilty about spending time too much like this. but I do. is it ok, if I cut ties with her/ block her contact. even though it'll hurt me and her. but it's for the sake of allah. to not waste away my time talking about usless things.? it really affects my concentration in salah. please advice .