@Cole2716 Even if you've only had a one-nighter, there's a lot more that needs to be done besides sheets, floors and trash, especially in the midst of a pandemic. All surfaces need to be sterilized, the bathroom done, the kitchen, and lots of other things. It doesn't just have to look clean, it has to be clean. And sterilized, unless you are leaving 24 hours between bookings, which it doesn't sound like you are.
And does she charge you more if guests stay longer and leave a mess? You can't just look at it in terms of each separate booking, you have to look at the long picture. And decide whether having an excellent, dependable cleaner is worth it, or you want to take your chances on someone else who may not do a good job.
Obviously, if her price is out of line with the going rate in your area, or if it means you aren't making any profit, or she's only there cleaning for an hour on average, and wants $140, something needs to change.