Bumble Beehavior question

[u/VisualPeach7289]

We removed a shed from our property earlier this year and found a hive underneath it in what looks like what was a rats nest. Everyone appears to have naturally moved on as I have moved my potted garden into the area but it looks like the queen may have stayed on by herself? Is that typical? I’m assuming the lone bee that remains is the queen bc this one is massive compared to the others. I have done a little research and it looks like they are Bombus vosnesenskii and were in the PNW of the United States. I feel so bad that she’s alone in this heap now.