Why Mainavati should not get moksh?

cause she is his wife thus other half. I read somewhere (Ramayan most likely) that once husband attains moksh, the wife does as well cause she fulfilled her job as a wife/ life partner/ other half. Its her job to stick with him through thick and thin and same goes for him. If he is not attaining moksh then she can't either. 

Mena is doubtful which is an obstacle in her path of getting Moksh. Devatas were bothered about Himavan not Mena. But kanyadan is a done by both of them, if anyone is doubtful that karma though is compelete but may not give compelete result to them. With their Kanyadan the marriage will proceed but their Mukti may not be achieved.

Moksh is an individual achievment, there is nothing like if husband doesn't get then even his wife can't.