we are talking fixed items like her dishwasher stopped working and a window broken due to vandalism . . .
It is legal. It is not typical, at least in my area. It would be a red flag for me if I was thinking about renting.
Yes, it is legal for the property owner and the tenant to agree in writing that the tenant is responsible for the first $50.00 of each repair or replacement that is necessary during the lease term.