idk what to do

ok i know this is probs a dumb thing to talk about on here, but i need your opinion/advice. i’ve been going through a lot lately (a break up, the transition of college) & i really miss a good friend of mine. we were best friends but we fell off in march of this year & we haven’t talked since. is it wise for me to message her, or should i just let it be? we used to argue like crazy all the time but we were also as close as can be. idk maybe i’m just in my feels because of the break up & whatnot, but things used to be so good a few months ago & now i feel like everything is falling apart.