Should i feel guilty about this?

i made a joke about my guitar teacher stalking this kid cus there was like 50 pictures of him and i said something like "why are you stalking the poor kid? thats not very nice.. haha jk." and i posted it on facebook on her Business page on one of the pictures of the kid. like 10 mins after posting said comment she sent me texts saying all this stuff about how i shouldnt ever say things like that and how terrible it was of me and how it will ruin her Business, and then she added that one of her other students took the picture, like it would matter. i then said sorry i didnt mean to offend you. and then she gets all pissy with me. usually she takes my jokes really well, and ive even joked about things on her Business page and she didnt flip. i really think she over reacted. yet i still feel really guilty, like i killed her dog or something. ya think shes PMSing or something? i have bipolar disorder and its easy for little things like that to get to me and put me into a depressive episode. i havent been depressed in a long time (about 2 months. i know it doesnt seem like a long time but to me it is) and about half an hour after she sent me those texts i started over thinking it and started putting myself down. and now i feel i cant make jokes with her about things and i feel like i cant be funny anymore. and being funny is important to me. i dont know how long this depression will last but its really hitting me hard. i dont want to get up, i cant laugh at anything, i cry a lot, and i now see the world as a dark, humorless place. all because of what she said. i have 2 questions. 1. What should i do about these feelings of guilt? theyre killing me. and 2. should i feel guilty about saying what i said? at first i didnt see it as that bad but after what she said i feel like i committed a crime of some sort :\