Is she going through menopause?

Lagely, my mother is has been extremely irritable and feeling hot all the day. Are these signs of menopause? If so, when will it end (sorry if this sounds mean but I her moodiness is beginning to get on my nerves)

she's 45 years old

Menopause starts after the cessation of bleeding for one year.
Your Mom sounds like she is peri-menopause...she is having symptoms due to the fluctuation in her hormones.
The only other way to check for this is... for your mom to get some blood work done & get her hormone levels checked.... It can last 10 years.

You did not say how old she is. But chances are she is. Most women begin this around 45 to 50 years of age and some early than that but as a norm if there is such a thing. But once you begin having a period you are sooner or later going to hit menopause. Someday you will also. I hope that you and your family will be as understand with it as they can. It is a big step for women because they no longer can reproduce and this is a big shock almost like if they get there tubes tied off. It is an adjustment.

I know how she feels! If she is older like that
guy said there, I am sure she is. Right now
I feel like crying for no reason. Whew.
Edit- yes, my night sweats started at 45
and now I get them in the day too.