There can be a bit of a confusion regarding some of the monsters in Rum Punch. For example, Mother Grund is called and Advanced Green Hag in the module, but her tactics section let her use abilities of a Sea Hag. So I have used the statistics of a Sea Hag and then applied the Advanced Template. rum_punch_monsters.pdf
The official explanation is she was supposed to be an old sea hag witch 2, but they changed it during development and never looked over the tactics. Hence why she's supposed to have ray of enfeeblement.