carry on with nikkah or get a divorce???

No no, don’t advise her to go for a divorce dear.. it’s a small problem, MILs are like this most of the times.. they usually taunt to their DILs. Its nothing out of this world happening to her. Just ask her to communicate with her husband and he’ll understand InshaAllah. and being a muslim going for divorce just for making their career is not a good idea at all - IMHO

Rest - you can see other’s advises too.. they’re also good and helpful.