Oddly enough, I feel like I'm in the same situation. I'm not completely sure that I understand the issue at hand here, but it sounds like your mother is depressed? I try so hard to fight to understand my mom, because I know she's depressed, but after a while I just feel so hopeless and I give up because I don't see the point if things are never gonna get better.
One important thing to remember there is always hope. Your mother might be going through some life transitions or just struggling with something she feels she doesn't want to be
I also totally understand how hard it is to put a smile on your face sometimes. The only thing I can say is that your mother needs to help herself before anyone else can. When you're in a rut, or depressed, only you can take that first step to healing.
Encourage her to see a counselor. Remind her that you love her and just want to see her happy because no one should live feeling so down all the time or angry.
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