I agree that the wording of the OP was perhaps a bit strange, in that expecting people to drop off cakes when we are all suffering under what's left of the lockdown might come across as a bit demanding.
But I also think that it was probably just an example of the way that the media can make it feel as though everyone else is having a great life when we (generic) aren't. It's a bit like seeing all the holiday photos on Facebook, or the smiling children with excellent school reports. Nobody posts about wet weekends or the days when the children are being horrible, do they? I think it is more of a general point about realising that she doesn't have friends, which becomes more noticeable when we can't get out and about as we used to.
It's not very helpful to tell the OP stories about how people host parties (how can she do that without people to invite?) or how to meet people with children the same age as hers (that works when they are school age, but not otherwise) and so on.
I left work recently, and found that not only did my social circle shrink, but that the friends I have in my home town were made at a time when I didn't really need the same sort of stimulus as I did when I was working. I like them a lot, but we don't really have as much in common as I would like. I am much more sociable than they are, for instance, and would like to have more people to go out with regularly (as I used to do after work when I was there). Also, they were already a friendship group when I left work, having been SAHMs when I wasn't, so they already have one-to-one things set up between them that I can't easily take part in.
Before lockdown, I signed up for a couple of local classes, so that I could meet others with similar interests, and was enjoying them, but of course they have been cancelled for the duration. I know that won't be for everyone, but there are so many different options that there might be something going on locally that people might have an interest in. After the initial class, which might be a bit awkward for an introvert, it will be very easy to attend without knowing people in advance.
It might be September before these things start up again (if we don't get a second wave), but there is everything from yoga to car maintenance on offer, with a lot in between, so the odds are that there will be something that might appeal, and it would be a start. When contacts have been made, it will be easier to suggest meeting outside of the class, or there is the option of hosting a charity coffee morning (there are lots of them) and invite people to that without worrying that you sound needy.