Last night, her brother and fellow Liberal Tony Abbott presided over a Coalition Party meeting that overwhelming voted against allowing its MPs a free conscience vote on gay marriage.
This is a huge blow for Christine Forster and her fiance Virginia, and means they, and other gay and lesbian Australians, cannot marry the people they love. Gay marriage now can’t happen until after the next election, when the Prime Minister has said he will call a referendum to hear what the people have to say.
Note to Tony Abbott - they say 'YES' - in about the same proportion as the Coalition MPs say 'no'.
Talking to Debrief Daily, a still upset Christine Forster tries to laugh through her disappointment - but admits she and her Virginia went to the pub last night to drown their sorrows with a beer.
"We are both very disappointed and millions of Australians are also disappointed by this decision ... I'm on an emotional roller coaster to be honest. Yeah, there are negative emotions around it."
We asked Christine if she was disappointed by her brother on a personal and political level.
"Of course I’m disappointed in my brother, it’s a personal issue … it’s linked with personal family relationships. I respect his view and I understand his view, but I disagree with it. This has an immediate and personal impact."
While Christine hasn't spoken to Tony Abbott about yesterday's vote she says, "he knows how I feel about it." She has chatted to other MPs supportive of a conscience vote and gay marriage.
She also suggests he may have misled parliament about it. "Six weeks ago the Prime Minister told parliament this would be decided by all of the parliament. But it can't be. Because all of the parliament can't decide now. One side is bound to vote no."
When asked if MPs and ministers should cross the floor to vote for gay marriage next week she laughs ruefully.
"I can’t speak for them, but if I was one of them I would be of mind to. But there's more at stake for me on this than them .. there are some fine Liberals who have worked hard for this and they won’t give up and I won’t give up ... It was what had been promised … It was the wrong result … I would have like to have seen my party make a decision about liberal rights to individual rights and equality before law."
So will she and her fiance Virginia go overseas to get married?