In my experience as a parent and after having had this conversation with countless other parents over the years, my conclusion is this: it all depends on your comfort level. Set some ground rules and be consistent and you and your daughter will be fine. Find a pacifier that she likes, and use it when she needs it. Set some ground rules for when she uses it that fit her needs and don't drive you crazy. Adjust those rules when her needs change (when she's sick, when she starts to talk, etc.) You can try to plan an exit strategy now, but what works will depend a lot on your daughter's personality, which you will, of course, learn a lot more about over time.
I have a 4 year old who was breastfed and lovvvveeeedddd his pacifier for a long time. It was attached to his shirt pretty much all the time for roughly his first year. When he started to talk (or, that sort of pre-talking where he knows what he means and he's trying to form words - and when they really understand a lot of what you say to them) we limited it to naps and bedtime. It stayed with naps and bedtime until he was 3-1/2. Our ped wasn't at all worried about it, he had excellent verbal skills and good social skills, it doesn't affect their teeth at all until the permanents come in. We were expecting our second, and it just seemed like he was probably ready to give it up. We let it be his choice - he desperately wanted a 3-wheeled scooter for Christmas, and we told him that was a big boy toy, and big boys didn't need pacifiers any more. Santa could bring him a scooter if he left the pacifiers for Santa (yes, w/the cocoa and cookies.) We gave him six weeks to get used to the idea, and even Christmas Eve, told him it was OK if he wasn't ready,that the scooter could come later, too. But he was ready, and he left them for Santa, and he got his scooter. The first week or so of bedtimes was a little rough, but we got through it just fine and he had no interest in the pacifier by the time his brother came along, six months later.
This seems to be one of those parenting decisions that you can really overthink and get obsessive about - and as you know, having older children, most of those decisions do not turn out to be nearly as life-threatening as they sometimes seem. So try a pacifier, see if she likes it, and don't worry about it too much. Good luck!