How do I prove I’ve been cleaning this whole time? Or how do I clean better?

A couple months ago, I ended up losing my job and had to move out of my place to avoid eviction. My grandma gave me the okay of moving in as long as I mop, dust, and wipe down the living room on a regular basis.

It doesn’t matter how often I do it, whether I clean it daily or weekly, she wakes up in the morning and tells me I did nothing. The room is still horribly dusty. She has air purifiers and humidifiers all over the place (3 of them within a 10ft radius), and one of the dusty tables she has 3 spider plants sitting.

Another factor, I got a new job and work overnights. I don’t get home until 9a, she wakes up at 5a. I’m obviously awake way later in the night than she is, so I’ve created a routine for myself to clean while she’s sleeping. It’s not my sleep schedule that’s the problem, I love working overnights and prefer this schedule. It’s just the long drive home makes me so tired and I prefer to sleep directly after work.

I don’t know how to show her what I’m doing unless I do it in front of her. I’m really stuck, even the dust is so bad you could wipe everything down and then 5 hours later it’s back to the original dusty state. Even buying new fancy cleaning gadgets isn’t making the dust any better. This living room is used probably 3 times a week (big house, other living rooms are used more often and aren’t as dusty). My grandma is also a smoker if that means anything.