Assuming Wikipedia is right:
Like most aspects of the disorder, life expectancy varies with severity and adequate treatment. People with severe haemophilia who don’t receive adequate, modern treatment have greatly shortened lifespans and often do not reach maturity. Prior to the 1960s when effective treatment became available, average life expectancy was only 11 years. By the 1980s the life span of the average haemophiliac receiving appropriate treatment was 50–60 years. Today with appropriate treatment, males with haemophilia typically have a near normal quality of life with an average lifespan approximately 10 years shorter than an unaffected male.
I’m going to bet on a saying no to her being able to use this as the sole reason why not to have kids. Especially considering that big of a rise in treatment just within 40 years, I bet any kids she has will not have anything to worry about in their future. This is just my take on it, although I will say in all of my studies I have seen nothing that hints towards her line of reasoning being considered a serious reason.