hatching under broody more than once a season

It wouldnt hurt just let he go broody if you need to hatch more chicks. Just depends, I had one raise 20 chicks before.

 

I think there is a good chance she will go broody again. I have one VERY broody EE who brooded last April, August, Dec, and this March! She has her latest chicks who are 4 wks right now. So I think there is a good possiblity your silkie could brood again later in the summer!
For a bantam, the number of chicks/eggs they can handle depends on how many eggs fit under them! If it is too many, some of the eggs will be cold and won't hatch well. I would say she could have up to 7 or 8 eggs if they fit comfortably under her? Maybe more if they are bantam eggs? Good luck!

 

Silkie #1 went broody in December and hatched out 4. She went broody again in April and now has two babies under her. (Sat on 8 eggs the first time, but it was freakishly cold and I don't know that my fertility was all that great. Second round was shipped eggs AND she had quite a bit of interference from the other hens that likely did in some of the eggs.)

Silkie #2 went broody in January/hatched out 4 in February. She's sitting on 8 right now, due in 11 days. (She had 7 eggs, but the temps dropped to single digits and I think some froze. Six of the seven eggs had chick development.)

I fully expect them to go broody again this summer. I have found with my girls that they can realistically cover 8 standard eggs. More than that and they shove them out of the nest or don't adequately keep them warm.