Is it strange that my mom thinks me not seeing/answering her calls right away is a ‘power move’?

I’m not very attached to my phone, I don’t use social media or any apps besides this one sometimes besides Spotify for music. I work full time and I’m pregnant and preparing food and my house and just generally trying to keep my stress level down. I don’t keep the volume on because it stresses me out to be on call constantly. I don’t think I’m the only one like this. My mom is a highly stressful person and calls a few times each week to talk while she drives to vent or unleash whatever anxieties she has on me. It’s never urgent and if it was, my husband keeps his volume on and she knows she can get in touch with me via him if there was an emergency. So I usually don’t see that she called right away but I call back as soon as I can. The other day I answered the phone on the first ring and she said wow I’m so surprised you actually answered. And I said sorry, you know I don’t keep my phone on me but I call back as soon as I see you called.

She told me she thinks it’s some kind of power move that I’m doing, to not answer right away and call her back when I see she called. Is that a weird thing for her to think? I’m definitely not playing any power games. I just don’t keep my phone on me constantly. I didn’t know how to respond to that.