Something's coming!

Evidence collected thus far:

• Mom did laundry mid-week.
• That laundry included full-size sheets . . . and her bed is King Size . . . so these sheets . . . must be going on a different bed . . . or two.
• Mom checked last night to make sure she had a cake mix.

Annnnnnnnd

she bought some wrapping paper.

WHAT CAN IT MEAN?