lyrica for the pain
If your mother has neuropathic pain then Lyrica is one of many options. A rehab doctor or pain specialist or neurologist can help identify something that should help.

in these cases the daily physiotherapy treatment for about 2 hours is the way it should be? Is it too much or too little?
Generally more is better - as long as your mother is tolerating it and not getting too fatigued. By most standards your mother is quite fortunate to get 2 hours of individual physio.

Now after about a month she can move her legs sits in the bed side without support for about half an hour 3 to 4 times a day and she stand with the help of the physiotherapist for 2 min. during the session, are we doing o.k
I presume your mother has had a severe stroke. In which case it sounds like she is doing well :-) This gives her a bit of independence now doesn't it and means she doesn't have to be reclining all day.