Sadly, she won't do okay being alone. Chickens are extremely social animals, and having at least one other hen pal is vital to your hen's well-being, a flock of three or more being preferred. What I would recommend doing is getting another pullet of the same approximate age and of the same size, preferable a breed that looks and acts fairly similar to yours (as in, don't get an extremely fluffy, tiny, and timid silkie or polish if you have a bold and personable barred rock).
If you have the time, what I have always had done when introducing new birds into my existing flock is to have somebody sit out in the run with the ladies and spray whoever is the aggressor with a water bottle for a few days for several hours when they get introduced to each other.
However, since you're only going to have one bird meeting one new bird, hopefully they would just be happy with the companionship and not go crazy on each other. Again, chickens are super duper social, and they'd rather be friends with that "weird and new" chicken than have no friends at all the vast majority of the time. If this isn't something you feel that your chicken would do (you know your hen better than I, an internet stranger, do), I would suggest googling "how to introduce new hens into a flock". There are a lot of really good articles out there, and maybe one of them would work for you!
