There shouldn’t be any problem.
However, she has to take the following documents with her:
1. Attach the old passport that has her maiden name (with which the visit visa was applied) together with the new passport.
2. Original and copy of the Affidavit stating the changes in her name
3. Copy of the National newspaper where it was published that her name has changed from “good” to “better”
4. Copy of attested marriage certificate both in India and Qatar or original if possible.
5. Copy of her visit visa.
6. She should be ready to explain and exercise patient.
Though am not and Indian but I think there shouldn’t be any problem.