Don't be too hard on yourself about your toddler being upset. I think these last few months, particularly if you may have been home more often - if she's been in school/daycare less regularly, have unsettled quite a few little ones (and not so little ones). Even my high schoolers are rather "off" right now.

My kids were always off and running without hardly saying goodbye to us - they LOVED daycare. That can produce the opposite thinking: "They aren't missing me." LOL. That really wasn't it; they just loved being at "Nana's house" (not a relative, just an older grandmotherly type babysitter) or at daycare.

My sister's daughter used to throw a fit about being left, and my sister felt badly about it until the teachers let her know that as soon as she was out of sight, she was perfectly fine - she always was a rather manipulative little bugger. LOL.