Maybe you don't delete her because you get something out of talking with her. So, either it's not all bad or a part of you feels a need to respond to her, maybe to 'prove' something? That part, only you know. Obviously she stresses you out, but there's likely something deep down you get out of the conversation, unless you sense there's more to her than what annoys you.

Sometimes people make themselves more interesting online to impress others, but sometimes people make themselves what they wish they were. For example, someone who says they have many sisters may actually have none and is overcompensating because they wish they had them.

Speaking of sisters, often siblings fight with each other but, at the end of the day, they still care. She may be mean because that's her personality, because she's been hurt and either she takes it out on herself or someone else, or because she likes the attention you give her and doesn't know how to get it otherwise.

So, pay close attention to when she is mean. Is it just after a bad day? In that case, she has issues of hurt to work through. Or, is it when there's not many people online? Maybe she wants someone's attention. In that case, you have the opportunity to help her. If you don't see her as a bully but just as someone who is lonely (not having any siblings possibly), you will feel more patient with her. If you only reply with nice things, she may eventually start learning she can get attention by being nice and copy you. If that works, you've helped not only her but you and others. If it doesn't, you might consider your friend's advice. Just keep your options open. None of us are perfect and we all say things we regret sometimes.

i would block her, if you do regret it afterwords you can unblock her, maybe. and besides no one needs that kind of agrivation, do put yourself through that, her tell her stories to some one who has that kind of patients, i know i wouldnt put up with for so long, and you shouldnt either. hope i helped!
Duke

Thanks everyone. ^-^ Uh..blue...guy was the most help :)

You're welcome! :)

Hey.. So, first off-

She may not be lying.

She may actually be like that, you never know! Don't delete her just yet, maybe try having a reasonable conversation?