She definitely needs a good immigration lawyer. I don’t think she can easily “give up” her Nepali citizenship and then get back her Indian one, because from what I understand, the moment you acquire foreign, technically your Indian citizenship is revoked. Though there is a process to surrender your Indian passport.
You can re-acquire Indian citizenship by getting OCI, having it for 5 years, and then residing in India for 1 of those 5 years. Though if she gets charged, this (getting OCI) is probably not an option. Good luck to your friend.