Congratulations! My son was verbally advanced as well, so don't panic. My guess is that you rarely, if ever, spoke to your daughter in 'baby-talk' and she has learned real language from you. Keep it up.
While you're at work, ask your caregivers to refrain from using cutesy words or voices when speaking with your daughter. Baby Einstein videos are good as are age appropriate books on tape.
When my son was that age he watched all sorts of movies and videos and developed appropriate langauge. In spite of my occasional sailor mouth, he never mimicked me or went through the 'bad words' phase. And,my husband actually watched endless hours of John Wayne Westerns with him (don't get me started).
Your daughter will continue to pick up advanced language skills and you only need to worry when she starts Kindergarten -- teachers don't like it when the kids can converse like adults! :)
C.