Prince Philip spent most of his time away from the Queen at Sandringham anyway before ill health and lockdown changed his plans to Windsor. Apparently his closest female friend was Penny Mountbatten, his carriage driving companion. The Queen was used to long periods without him and I don’t think he was the easiest person to have around. Not exactly Darby and Joan, although he was a great support through the years.
As mentioned before, it’s not as if she has to cope alone, without much help, as we might do.
The Queen is going to be a very very hard act to follow and I would not like to be in that person’s shoes.