Is this acceptable behavior for a 6 year old?

My 6 year old sleeps with a Google mini in her room for white noise. Every few months at night there will be a wifi outage in our area and it goes out.

Every time this happens, she wakes up screaming bloody murder. I have explained to her that the internet will come back on and we need to wait and not wake mommy up (she knows how to turn it on) but she will scream like a SIREN.

I'm sick and couldn't fall asleep due to congestion last night. She wakes up while I'm tossing and turning at midnight because it's off SCREAMING.

She has a baby sister who is next to her room, I go in there and explain she CANT scream as it's disrupting the rest of us and she has nightlights and has to wait until the wifi comes back on for her white noise.

She whines and screams.

I tell her to go to bed or read a book with her nightlight.

I go back to my room and she screams ALLLLL NIGHT until 3:30 AM, every few minutes, so that I had to keep getting out of bed to get her to stop because the white noise wouldn't come on.

At 3:45 I lost my shit and yelled at her to be quiet or I'm closing her door and I'm not coming in again.

I got 2 hours of sleep, sick, and pissed off.

Her Dad said I overreacted and she's "only 6." But she sold enough to understand NOT to wake up SCREAMING unless she's bleeding or there's a break in.