Yea your mum does deserve a good guy but you don't deserve to feel isolated as a result of this...
You say they just got engaged? Maybe a gesture like a 'congratulations on your engagement' card? Something small that just shows you support them both...
Maybe talk to her about the wedding plans, ask if she's thought about any? That way you're showing an interest too. That may help calm her down knowing your happy for them and interested in the big day...
One thing I'd definitely do regardless of whether you do either of the above is next time she says something out of turn or twists something jus confront it there and then. Ask her what the problem is and tell her you can't help feeling she's pushing you away and you don't like it, even if its in front of other people - shows you have nothing to hide.
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