How old is the chick?
Has it fluffed up now?
Is it still in the incubator with the other chicks and how many others?
*She has to make sure it stays warm enough tonight* - this is critical. What is it in?
Can she send an updated pic?
A few drops of sugar water are ok. Drops of electrolyte water or plain water are good, but just be very careful to not force it to drink. It can aspirate the water into its lungs. Either dip its beak in a very shallow dish, or do one drop at a time at the side of its beak with a dropper and wait for it to swallow before giving it the next drop. It can have as much water as it will drink, but just don't force it.
Its possible it will absorb more of the yolk. It concerns me that the shell is still attached though. Let us know how it looks in the morning!
I had one with a yolk that didn't fully absorb. The shell fell off after an hour or so though. After a week or so, the yolk dried/shrank a bit and we brought it to the vet to take a look. She removed some of the dried yolk, but then had to put a stitch in the abdomen. She reported that it might have been ok to leave it for a bit, but she decided to remove the yolk instead. She is doing fine and her name is Stitch. She is about 10 weeks old.