She lives in a one story house there aren't any stairs

Ice

One.
Because if 10 people eat 10 cakes in 10 days it means that each person eats a cake.

10

A centipede flipped over.

A cloud.

Answer is both 1 and 9 whether your using PEMDAS or BODMAS

Stop imagining!

An owl!

Race car.

Bottle.

Someone