Advice Please!!

So, to save y'all from a unnecessarily long story, I recently reconnected with an ex-best friend after not talking for a year and a half because of some bullshit drama she started and had her other friends try to frame me for doing stuff that I didn't even do. I tried to give her the benefit of the doubt, and rekindle a friendship, but every time we had a conversation she would either be bashing on someone else or she would pick a fight. So I, like any sane person, just stopped responding. She's now bombarding me with text messages asking for "and explanation as to why [I'm] doing this to [her] again." I don't have any respect left for this bitch, but I don't want to respond because she's been known to take screenshots and send them around. Should I respond in a polite manner (knowing that she will start a fight and more drama and bring my mother into it) or should I just continue ignoring her texts?