Once you have successfully kissed Mrs. Plum, you can purchase the following items from her:
- Black Cookie - 80z
- Heart Chocolate - 160z
- Mochi-kebab - 320z
- Popsicle - 200z
- Micro Gum - 1480z
The Popsicle is neccesary for obtaining Dr. Dandy's kiss.
Go visit her at the snack shop after she is mentioned on the third page of the paper. When you speak to her she can't speak, so you need to get her dentures back. The Underground Resident Dr. Fill has her dentures. (see Dr. Fill) After you get Dr. Fill's kiss he'll give you the dentures, return them to Mrs. Plum for her kiss.link