New owner shy cat

Hello,

I recently adopted a beautiful 1 year old Russian blue female. The old owner was rehousing and listed the cat as very shy. This is not my first cat, but it is my first cat on my own.

I brought her home yesterday, she is very very scared. She ran under my dresser, hissed and growled anytime I got close to her. I am pretty sure she did some exploring at night but when I woke up she was in the same spot. The old owner said after about a month of having her, she was finally able to pet her. Any suggestions on forming a bond with this cat and how to calm her down?

I want eventually be able to show my family members by pet and got her as a companion to lay with (hopefully eventually). I have heard feliway optimum can help, thoughts?

Thanks!