How many standard size eggs can a broody Silkie hen handle?

So I have a Silkie who is broody for the first time. I decide might as well let since this will be a first learning experience for both of us so I gave her 6 standard size/ large fowl eggs for her to brood. Is 6 eggs to many for her to handle or should it be fine. It's only been a few days since she sat on them.