This would be my local rape crisis centre.
I don't think that you can take from the film that Mridul is achieving sexual gratification from the role, as OP states above (unless I've really missed something). However, I think it's appalling that she didn't reveal she was not female when applying for the role, and to her colleagues initially. And I also think it's an odd choice of role - plenty of opportunities to work with minorities, vulnerable groups etc without needing to focus on such an intimate experience of sexual abuse.
The centre is not just for women, though I assume the vast majority of people needing its services are women.
Their website does state that it is 'women lead'.
I sincerely hope that Mridul wasn't involved in direct support or counselling of vulnerable women without it being very clear that she was not a natal woman.