Should we get over it

My siblings & I are all adults now, mid to late 20’s. Some of us hold a grudge towards our mother for things she’s done to us when we were kids. Abandoning us for months at a time, drug use, cheating on our dad, messing around with younger guys, verbally & physically abusing us. We’re not close to her & don’t really talk to her but there’s times now where she’s needs help with situations she continues to put herself in & we don’t jump to help her because all she’s put us through. She says we need to get over it. Is she right? Should we just get over it because she’s our mother?