Yes, it will get better. It may just take a few more weeks.
It's hard to read the comments of people telling you that your child would be better in your care only - I'm a working Mom, always have been, and I am a good Mom. My children are the most important thing in my life, but I neither had the choice to stay home, nor do I believe I could have given to my children everything they've gained by being in Day Care.
Our kids were 2 years and 9 weeks when they went into an organized Day Care facility. It was the best decision we made. The following week I was diagnosed with cancer and went through 5 months of treatment. I chose to continue working but could not have cared for my kids during that time - having them in Day Care was the best thing for us, and they both really love being there.
Despite being in the Day Care almost 2 years, our 3.5 year old son had a tough time adjusting to being in a new class (where he was reunited with several old friends). Our daughter didn't shed a tear when she transitioned a few weeks ago.
I'd hang in there and give it some more time - we had to continually encourage our son and let the teachers do what they do best. If it's really getting bad, perhaps this just isn't the right facility. We took the approach of, "we can always make a change if needed" with our kids, but we've been really fortunate to have found a great place.
We all have our own reasons for why we need to work or put our kids in Day Care. It's hard to feel like you need to justify it to someone who's made a different choice. But, I promise your daughter will begin to get comfortable and will begin to flourish. Ask the director/teachers what you can do to help make the space in day care more pleasing for her? All our kids needed was a favorite blanket, and it seemed to help calm them down quickly.
Best wishes.