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I wanna ask that can a pregnant refugee send invitation letter to her mother for visitor visa???

Yes - you certainly can.

Unfortunately the visitor visa has an extremely high chance of being refused.
 
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Ok thank you.
Even if mother shows strong ties to home country,then is there any chance of visa approval??? Mother wants only two months TRV During and after her daughter's delivery time and will surely go back.
 
Almost no chance, but the only way you can find out is if you apply.

Your mother would not be permitted to care for the child - that is illegal work.

The visa officer will be concerned your mother will claim refugee status as well.