Question

Choose the correct item. 1. Whereas/Though her staying at home, she spends a lot of money.​

Answer 1

Though her staying at home, she spends a lot of money.​

Whereas не подходит, потому что используется, когда мы сравниваем два факта, чаще в официальных стилях.

А в вашем предложении есть значение уступки. Значит, выбираем though.

Answer 2

The correct word to use in this sentence is "Though."

The corrected sentence is:

"Though she stays at home, she spends a lot of money."