As others have said, the MMR vaccine contains a mixture of live viruses.
One of these viruses, rubella, is one of the major causes of birth defects in the US. Doctors routinely screen pregnant women for the so called TORCH agents (an acronym for TOxoplasma, Rubella, Cytomegalovirus, and Herpes simplex), all of which can cause severe problems during pregnancy.
Becasue the vaccine contains live Rubella, if she were to become pregnant, some complications could present themselves.
BTW, I'm not an M.D. (but I am 6 months away from a Ph.D. in Microbiology and Immunology), but I would guess the nurse told her 6 weeks instead of 6 months.
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