My fiancée is too mean

My girlfriend of five years is a doctor and takes home a huge salary but she the stingiest human I know.

In fact, she earns way more than my teacher salary.

However, despite her earnings, she never spends on anything. Not ever clearing the water or Yaka bills. She can't even spend on her hair.

Honestly, I am overwhelmed by the expenses and wish she could contribute to the daily running of the house we share.

I want to confront her but I don't know how.

Please advise