1) best option for your daughter is to in for mutual consent divorce .
2) in the consent terms she can seek custody of the child
3) in addition she should seek maintenance for the child
4) if husband refuses to grant custody / maintenance she can file Domestic violence case against her husband / in laws
5) seek protection order from court against husband and in laws
6) in DV case she can seek maintenance for the child also .
7) since wife is working she wont get any maintenance
8) wife can also file for contested divorce on grounds of cruelty