I do sympathise to some extent as I'm sure it's horrible... but I can't help but think it's a bit weird that she was off going to weddings during a new wave of covid, knowing full well that she's unvaccinated with an underlying condition.
I'm not sure I buy the 'allergy' excuse either (it'd have to be a very niche allergy to be allergic to AZ, Pfizer & Moderna... First time I've heard of that happening?).
Even if the allergy is true (I'm not a doctor so what do I know), surely common sense says you'd avoid social gatherings such as WEDDINGS if you know you're highly vulnerable yet can't be vaccinated? She's learning her lesson the hard way.
That said, obviously I hope she recovers and no one deserves to be hospitalised with covid, no matter what silly decisions they may have made. I'm sure she will be fine though given she's well enough to be documenting the whole thing.