I now believe my step kids mom is Satin!

Tiffany
I've been dealing with my step kids mom for 4 years now... She's the type of girl who if she doesn't get her way she instantly uses the kids against my husband. Well they are back at it again and she always attacks me!!! I've been quiet, I don't get involved with their arguments, and I've never treated the kids any different than I would my own. Frankly I think I'm a hell of a good step mom (not trying to toot my own horn but toot toot!) so this is what she says when I'm not even the reason for their argument AT ALL!  She's also aware that the likely hood of me having my own child is slim due to health reasons. It's one thing to create drama but it's a different story when you say things like this. It just bothers me that I'm being attacked when I did nothing at all. And to say I don't deserve my own child is beyond bullying. And no my husband never said he didn't want another child, and yes my husband does support his kids. She says these things to get us going so we retaliate. Personally I could destroy her world with one simple text to her husband with a nude pic she sent my brother since she's been married. I just don't want to stoop to that level until now after I seen what she said. Should I? Or should I "be the bigger person"? Sometimes I hate having to act like an adult while people continue to say horrible things :/