BogRollBogoff said it all well, as have many others.
The main aim for each of us is to survive this. So most of us don't want to risk getting it, because it seems there's no way we can predict how it might go for us, apart from doing out best not to be overly fat.
So we have to avoid it until there's a vaccine or effective medication or both, and if some herd immunity is built up that will also help us.
The NHS seems to be doing extremely well, and stated that they now definitely have enough beds and ventilators. The PPE seems a bit more hazy.
So: although we are part of a national effort, we also have to look after ourselves as individuals.
Social contact, physical exercise, being outside (in the sun even) and not feeling trapped are all essential for our healthy survival. And we can achieve this very easily within the rules. We can go out to exercise. We can go to the food shop. We can go to Boots. But we must keep always in our minds that every single trip where we are near people, or where they have been, is a risk to ourselves. So, naturally, we should protect ourselves on these trips, and keep them to a minimum.
I felt quite freaked out by it to start with, with a nervous fear about catching it rising several times an hour. I've fallen into anxiety fatigue now, and have landed on the solid ground of if I don't go too near anyone, or anything that could have it on its surface, then I won't get it. But I also know people who think they're ok to meet friends and family, and this gets me so much, out of fear and also outrage, that I even had a lockdown nightmare last night, where I was shouting at them and insisting they get out of my vast loft-style apartment (my subconscious must have added that in as a bonus! I also had a delivery of enough smoked salmon to last a year!! And random lockdown-flouting acquaintance were turning up and eyeing it!!).
I would do as Bogoff says. Do your thing. Ignore her; let her catch it and/or add to the beneficial herd immunity. Give her a wide berth for a while when this all ends. And yes I think you will not feel as close to her as before. Because a fundamental difference between you has been thrown up. So the only thing really to feel upset about is the loss of a friend.