She'll be fine with LF...you've given her 4 eggs and that is a good number...I have trouble getting 6 hatched with a Silkie in cooler weather as the fringe eggs seem too get to cold. The chicks will grow faster such that she'll be dwarfed by her children, but she'll do her best to keep them warm and loved and it will be endearing.
Since she is on almost an perpetual brood, just give her some extra treats that are high protein and good probiotics like chopped eggs and yogurt. You might put some Chick Saver vitamins/electrolytes in the water...that's like Gatoraid.
I typically just keep my perpetual mommas on the Chick Starter (non-medicated) and Chick Saver as it is high protein and high vitamins for those quick snatches of food she'll be getting and put out the calcium grit for those seasons she is actually laying (few and far between).
You should also check her over for mites/lice. Silkies are a magnet for those anyway, and a broody hen doesn't dust bathe as often which can cause a build up. I shake a little Poultry Dust (permethrin type) under the bedding (but not so it comes in contact with the eggs) and using a sock with the powder in it, powder puff her under her wings and at her vent. I once had a small out break when the babies were hatched, and I simply dusted momma really good knowing the babies would run through her feathers and get treated as well. I had no issues.
Happy hatching

LofMc