There have been a family of hedgehogs in my garden over the winter and the mother has recently disappeared

There have been a family of hedgehogs in my garden over the winter and the mother has recently disappeared.

I have a hedgehog house in my garden and there was a mother hedgehog that was there over the winter and had two hoglets in the spring.

I had seen the two hoglets about the garden but not the mother for about a month so I did check the house about 2 weeks ago and all 3 were there. I then checked it a week later and the mother wasn’t there in the day and I haven’t seen it in the garden for a while.
The 2 hoglets I have seen in the garden tonight.

I realise that a likely scenario is that the mother has died, but is there any other possible scenario?

I’m guessing that the hoglets would move away to find a new shelter rather than the mother doing so?

The only other thing is there is only really one way into the garden under a wooden gate which the hedgehogs have to squeeze to get under, although I have seen quite a few come in and out that way it could be a problem if one gets too big.