Until you can integrate her safely and if you can't get another, put in a mirror and another stuff similar size critter. the mirror will really help.
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She may be lonely now, but the real serious problem will be when you try to integrate her with the rest of your flock when she's old enough to go out there with them. The way of chicken world is they run in packs. The chicks of the same age who are raised together will form a unit for life. They not only keep each other company, but they derive their self confidence and protection from being part of a unit. Chicks of units of four or more do much better coping with life in a flock of older chickens. It's even very hard for just a unit of three chicks when it comes time to face the big, scary adult chickens. One chick will be almost hopelessly lost, a misfit almost for certain, and it will have an awfully hard time because it will be the only smallest one, therefore have a bigger chance of being bullied and pecked to death.
You need to show this to whomever is making the decision that you can't have any more chicks. To raise just this single baby chick is really quite cruel. It needs at the very LEAST, two others of the same age. It doesn't even have to be the same breed.