Assuming that you emailed these articles in a neutral, "just thought these might be helpful as you decide and plan for the baby" kind of way, I don't see any problem. Overall, the nanny-employer relationship might not be the best forum for any more forceful "lactivism". A;; you can do is be quietly supportive if she does decide to nurse and just plain quiet if she doesn't. What you WILL be able to do as a nanny for this newborn is, if ff is the choice, make that as positive as possible. This baby will get a bottle regardless when mom is working. It would be best nutritionally if that bottle were fulll of breastmilk, and best emotionally if baby and mom could re-connect after work with nursing at the breast - but if that isn't the choice, you can't change it, so focus on what you CAN do. Dr. Sears has a great section on "bottlefeeding with love" that talks about how to get the bonding benefits by holding baby close to the chest, looking into babies' eyes, feeding on demand, etc., just as you would if baby were nursing.
By the way, sorry I know you are not asking for advice on this but I hope this job is a better fit for you than it sounds. I can tell you are kind of stuck with this opportunity for now for money reasons, but I worry. This MAY not be the case but what if it turns out that this c/s-planning, ff-feeding mom wants you to: feed on a strict schedule every 4 hours, even if baby is hungry more often? help her sleep train a 3-week old baby by crying it out at naptime? start feeding solids at 4 months whether baby is ready or not?
Have you discussed any of her thoughts on parenting approaches? Do you know how you will handle it if you don't agree with them? Of course, its tough to say in advance how anyone will really choose to parent - most families who co-sleep or nursed past a year never planned it. Hopefully these folks will turn out to be in line with you when the time comes. If not, I hope another opportunity will come along for you. I think it would be really hard to have a conflict between your philosophy and a child-raising job.
I searched long and hard to find an attachment-parenting nanny who nursed her own dd. She supported my nursing/pumping for 2 years, rocked my kids to sleep every day, wore them in a sling, and parented exactly as I would during the day when I wasn't there. There may be a family out there where you would be a dream come true!