Q. If a woman at the Sedder chooses to recline while eating Matza or drinking the four cups as mendo, can she do so?
A. Shulchan Aruch (O.H. 472: 4) and other Poskim rule that although women do not have to recline while drinking the four Kossos of wine or eating Matza, if they are considered women of importance they should do so.
Remah (ibid.) adds that even if they are of the essence and honorable the tradition for them is not to lean, since they rely on the opinion of the Rabiah that times have changed and no women recline at all in our days. Mishna Berura’s opinion (12, 13) is similar.

Kovetz Halochos (21: 11) quotes Horav Shmuel Kamentzky’s Shlit’a opinion that they are allowed to recline if they choose to. Horav Aharon Miller’s Shlit’a opinion is similar

Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit’a