I don't think it's a big concern at this point. See what her permanent teeth are like. And I've heard it's good to start taking kids to the dentist at about 3, so if you go in a few months, the dentist might have more info.
On the other hand, the nuk is probably not a good idea. I know they've come a long way so they're not supposed to hurt their teeth, but it might have an effect on how her permanent teeth come in. It's a really tough thing to get rid of - we went through that battle with my son at about 18 mos. - but it's worth it in the end. Your daughter is probably old enough to understand trading in the nuk for something she'd like - maybe a new toy or something cool for her room. Or I've heard some moms say they convince their child to "pass on" their nuks to a new baby the family knows. Pack the all up in a baggie and make a big show of giving them to the new baby. (Of course, the nuks end up being thrown away or returned in secret to be stored away.) Just some ideas.