Henny feathering is autosomal and dominant from my understanding, so chicks of either sex should inherit it from her if she has it. However, hatchery Sebrights often lack the gene or are not pure for it, so you may or may not see it in her offspring.
Yes, she does appear to have a rose comb! The rose comb gene is completely dominant, so even if a bird has a rose comb, it's possible for that bird to be split to single comb and thus possibly throw the gene for single combs in its offspring with a single-combed mate. This is happens quite a bit...
Yes, they would be sexlinked (golden males that look silvery at hatch, gold females) and have rose combs, assuming your Sebright is pure for that trait. Sometimes Sebrights carry a recessive gene for not-rose combs, so it's possible some of their offspring will have single combs as well if that...