irregular light periods no periods for 6 months

hi, i've recently starting seeing someone who i'm very much in love with- however slightly worried about her health - we are both in our forties, slim, eat well and exercise however recently she has admitted she didn't have a period for six months last year and since then its been irregular - she gets occasinal water infections and never has been pregant or had any pregancy scares - she was on the pill for a long time and we are now trying for a baby - she thinks she can't get pregant but we both know we would be great parents and have a good life together - she does drink a bit and smokes about 10 cigerettes daily. i have spoken about her drinking (not daily but regular up to 3 glasses of white wine regularily and when she goes out with the work girls (she works in a stressful job in banking) she drinks to get drunk.

i don't drink much and go without drinking for up to 6 months at a time and hate to seem a nag to her but i think she is hiding her head in the sand about possible health issues around her waterworks and ovaries