My little one has been in MDO since she was 18 mos (she just started her 3rd year). The first year she cried, off and on, throughout the year. The second year she went in without a tear every day. This year, however, has been a killer for me! The year started out during my husband's one month training (away from home) and she was stuck to me like glue. I cried that day. The second day she refused to get out of bed, get dressed, get in the car, get out of the car, etc. All of these things I had to bribe her to do because I have a 7 year old who HAS to be at school on time, and the little one was going to make us late. When I finally got her into school, they had to peel her off of me. I cried again, several times throughout the morning (when I called my mom, my best friend and my husband). The following Tuesday my husband was back home and she refused to go again. We let her stay home with him because he'd been gone so long, and boy did she gloat all day long! He's been home for 2 weeks, so he's been taking her and the first couple of times she cried. When he dropped her off today she walked right in and owned the place (that is her usual personality).
I think its completely normal. There are days when we, as adults, don't want to do what we have to do. We forget sometimes that our kids have ups and downs...and especially at age 2. She's still figuring so much out! I know its hard on you to drop her off and wonder how she's doing. Maybe you could try to plan something to keep your mind busy for the first hour or two after you drop her off...morning coffee with a friend or something like that!