Usually they are upset at first, especially if the separation is a new thing, but it almost always passes after they're distracted. The key is to make your goodbyes fast but loving—a hug and a kiss, and a promise that you will be back later. 

Will you be able to introduce her to the daycare gradually (ie a few hours the first day, a longer day the second, until she's there the whole days by the second week)?  Does she have a "lovey" at home that you can send with her for comfort?

Hugs mama! I know this transition can be hard for babies and moms, too. I'm sure others will add their experiences/advice here too.

 It's really hard to leave your baby with someone else. My daughter is 16 months and has been in daycare since she was 10 weeks, and it's still hard for me to leave her.  It makes it easier if you take the time to get to know her teachers, and I agree with Amanda...take her for just a little bit of time the first day, get her used to the room, the teachers, the other children, etc.  That first day, stay with her (if you can).  With my daughter's daycare, they recommend that you bring an item from home that gives your child comfort.  Her teachers make sure that none of the other children take her blanket away, and that it stays with her coat, diaper bag, etc.  Also, in my daughter's class, they sleep on cots instead of in cribs.  This was a huge transition for her (she kept falling off the cot at first), but she got used to it after just a few days.  She looks forward to going to "school" every day and asks for her friends by name!  Good luck momma!