If you are not sure, consider the following gifts:
The gift of keeping in good health, sending health and filial piety. You can choose one of the following: relaxing foot bath, massage chair to eliminate fatigue, cervical massager for sleeping, etc.
Taitai oral liquid, eagle American ginseng, good quality silk scarves, necklaces (such as jade Guanyin) pendants, watches, jade bracelets.
Send another bunch of carnations on your birthday, so that your girlfriend's mother will be very happy.