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Hard to say whether she knows silkies or not. At 5 months, it would be the very, very rare silkie who is laying; at that age it is common to still not be able to tell gender (especially on better quality birds). Supplements such as table scraps and grains are usually good for the birds, although exactly what the scraps and grains consist of makes a difference, and it shoudl not be the bulk of their diet. At 5 months, mine are usually on gamebird rations, although they still may get some chick starter. I never feed scratch (well, at shows they get it, but that is the only time).
If you get them, I would ask when they were last (if ever) wormed, and with what. I'd also look them over closely for lice/mites. Depending on her answer and what you find on the birds, you will probably want to worm them, and also treat for mites/lice. Very definitely keep them in quarantine for at least 2 weeks; 3 to 4 weeks is better.
As for whether to, how many to get? Base it upon their appearance--both their quality and health. If either does not look right, find another breeder, but if they look good, then get the number that seems best to you.