It can definitely be a contributing factor, last time she had covid was about 8 months ago.Could it be possible in both cases these are post-Covid related? It has been reported that clots, brain issues such as dizziness, etc. have been associated with those who have recovered from Covid-19. I'm far from an expert, but with no prior history for either of you, it could be a possibility.
It can increase risks but isn't really a cause on its own.