I had a friend who said the same thing to me. I called her (not ideal but we were in different cities) and told her that I loved her and would support her in whatever she decided. I told her that I already adored her 7 week old fetus, and wanted to make sure that s/he had the most amazing life possible.
Then I told her that *I* needed her to know why I think breastfeeding is so important, and ask her to read some evidence (kellymom was the source I gave her I think). If my friend decided to breastfeed after reading up on it then I would support her (pay for LC, cheer-lead, talk to her hubby about it etc.) and if she decided not to breastfeed after reading up on it then I would know she made the best decision for baby and herself in her circumstances and I would also support her.
She read up on it and breastfed for 7 months, after a really rocky start, which she pushed through. I am SO proud of her. Here on MDC 7 months is probably less than average, but that is 7 whole months (6 of them exclusive - no formula even in the rough patch after birth!) for my little nephew (he calls me auntie even though we are not related.) 7 months he would not have had if his mom hadn't read up about breastfeeding, and decided that it was worth it.
Also, she confided in me later that the info I gave her on drinking while breastfeeding helped her to stick it out. She loves a glass of wine with dinner and could not imagine going for longer than her pregnancy without enjoying this important part of her culture. I gave her Jack Newman's info that says it isn't a big deal as long as you can parent.
I'm so glad I spoke up. I'm so glad I encouraged her to become informed. And I'm glad I was there to support her either way.
hth!