Yes, she'll be lonely and most probably drive you batty with her endless peeping.
Do you have or can you purchase a feather duster? Sounds funny, but it works.
If you don't have one handy - it should be a clean one - try giving her a small stuffed animal or hand mirror for company.
Good luck to you!
it should be fine with your two week old chicks i have had many hatches go bad and have maybe one or two eggs hatch and i would add them with the older brood after a week to where you know its getting around good.... id place it in there and watch the reaction of the others....and if they start pecking take it away and if they dont then leave it and check on it every so often