Yes. In fact Sara Gilbert was always a lesbian, though she may not have figured it out until puberty.
People are lesbian from their very early years, some say from the time that they're in the womb. Some women know this very early and never marry; others become sure later on. It may be this that happened with your mother. If she's happy for you to know she's a lesbian, she's probably happy to talk to you about it, if you have questions. In fact, she might be waiting for you to ask her.
Elliot Gilbert is 21 years old
Roseann "Rosie" O'Donnell is 55 years old (born March 21, 1962).
No.
Gilbert Gottfried is 62 years old (birthdate: February 28, 1955).
Gilbert Arenas is 35 years old (birthdate: January 6, 1982).
Gilbert Arenas is 35 years old (birthdate: January 6, 1982).
Gilbert Brule is 30 years old (birthdate: January 1, 1987).
Gillian Gilbert is 50 years old (birthdate: January 27, 1961).
Gilbert Levine is 63 years old (birthdate: January 22, 1948).
Gilbert Montagné is 59 years old (birthdate: December 20, 1951).
Sky Gilbert is 58 years old (birthdate: December 20, 1952).