tip or no tip house cleaner

Chelsey

I have someone that comes 3x a month for 1.5 hrs each time. she accepts $20 per 1.5 hr

she isnt a professional or have her own cleaning business, she does it on the side for me in addition to working for someone else that actually does have a business. but my cleaner just comes on her own for that price above.

should I be tipping her??

if so how much each time??