Srimathe Ramanujaya Namaha, I have read about the samashrayanam ritual, is it permissable for a women to undergo Panchasamskaram from the acharya?

Answer: Yes, a woman too get it from the respective family acharyan. Thoughl, the Samasrayanam & Bharanyasam are given to women disciples, but in general, it is best advised to take it  from the Acharyan as couples – husband and wife together.