Visit visa for mother after one 6 months visa in the past

[irman82]

Hi,

I am applying visit visa for my mother .She has visited UK once before for 10 days only and have few visits to united states .I was wondering to apply for 2 years visit visa .As applying for visa and travel to another city in pakistan is distressing and annoying.
Suggestion from senior members is it right thing to know ? apply for 2 years after one visit .She won't be staying more than 2 months (coming to give me psychological support due to covid and need that help while working in NHS and living alone).

Thanks in advance