There are two different issues here: whether it's desirable/possible medically, and whether it's OK for a child to have an older parent.
As regards having an older parent: of course there are potential problems, but there are problems with any set-up. As pp have pointed out, many children have been brought up by their grandparents. And with the present life expectancy, and even healthy life expectancy, being what they are, the chances that the child would have to deal with her mother's death or serious health deterioration before adulthood are fairly low. Higher than for the child of a younger mother, but not high.
However, even if donor eggs are used, the chances that she might not be able to get pregnant; or have pregnancy complications that might be dangerous to the baby as well as herself, are , I would think. fairly high. She will presumably need a lot of medical advice and support to be able to get pregnant in the first place, and the medical advice may well be 'don't do it'. In which case, it probably won't happen.
But a lot also depends on her circumstances. Does she have a supportive partner, and a good support network? Why does she want a baby now, having not had one in the past? If she always wanted a baby and was prevented by circumstances that have now changed, it's a bit different from suddenly feeling broody. It does occur to me that the isolation of lockdown might have led to uncharacteristic broodiness, and that this might not last.
Ultimately, it's up to her, her partner if she has one, and her doctor(s).