Suggest Effective Treatment For An OCD

Question : Help diagnose what's wrong with my mother by discussing it with me on here. Also, give me advice on how to deal with this.

Hey there,
She was diagnosed with OCD, apparently. But, some of the things I've witnessed make me think there is more going on.
Highly suspicious, cannot get on with people, takes the stance of always being right. Everyone else is at fault, never her. When growing up she showed aggressive rages, although these have calmed down.
Anything else ask me. I was worried she was narcissistic, but I question this with myself and others, too. Probably overthinking that.
She has fallen out with the entire family, she's convinced me that it is all their faults, and whilst it partly could be, it's typically how my mother is. I see my other family members, and they're able to get on with people, where as my mom clearly cannot.
She claims her issues are because of her family, and this may be true. But I find it hard to believe.
If someone does something she dislikes, that's when she gets into a strong mood that is 'obsessive' aggressive and over the top. Often it could be something small, like a neighbor parking a car outside the frontage (even though it's away from our drive) - I guess this can make people in general angry, but my mother doesn't seem to be able to drop things easily.
Hope you can help me understand better as to what is probably going on. I've said to her that her behavior isn't always correct and she can't blame others as though she is some perfect person.
She does use the mirror a lot, I asked why, she claims it's the OCD and that she's plucking out hairs. She said she isn't looking at her self (which would be narcissistic, from what I've read).
She can twist things, but isn't a typical liar. She is very trustworthy with me, but not so with shops. She will buy a DVD and then take it back and attempt to get a refund on a weekly basis. She used to mark clothing in order to get a refund if it wasn't right. If a family member purchased something for me when younger, it would need her approval (fair enough). But my aunt, for example, purchased a TV for me and it wasn't the color green (quite fussy). She smashed up a gaming console my dad had brought me because she couldn't stand the size of it (maybe OCD?) but was very hurtful to do in front of her son.
Hopefully you get some insight from what i've written, please ask anything else.
Thanks!

Hi, please provide me some advice and idea about the condition as the above isn't possible. But she has seen psychiatrist as said.I'd like to understand about what is going on, if it is more than OCD etc.