Hi T.,
I am a mother of three and also a daycare provider. I have been in your shoes and now am at the other end as well.
First the "stranger danger" that your daughter is showing is completly normal for her age, and in addition to a normal age thing she is also sensing your anxiety. When you are out with her and notice the stranger anxiety, just try to stay relaxed yourself and tell her that it is okay this is ____ mommy's friend.(or whom ever the person is) but do not force her to socialize with that person. Most children outgrow this stage... others do not ( my 11year old daughter is still very withdrawn around strangers, untill she gets comfortable then she opens up.
Second, the daycare thing... you will hear many people against centers and many people against home daycares. It all goes back to personal choice and comfort level. Centers do have more rules and regulations that they have to abide by from the state than home daycares. I know this because I assited my sister in her home daycare before we moved the buisness to a center, so i guess lucky for me i have been familiarized with both settings. One thing i tell all my parents is to read your children. after about the first week your child should calm down when you drop her off. she may still cry... because children even at a young age are smart... they know how to pull at our heart strings. If after the first week she has changed her moods and activity levels.. then something is making her uncomfortable.
Also talk to the provider... in the State of Michigan every center needs to have a primary caregiver for each and every room. In addition Infant and Toddler caregivers need to have additional trainings in development and social and emotional needs and behaviors of infants and toddlers. So ask them if they have all of their training hours in for the year. and make sure you keep communication open with her caregivers. One thing i tell all of my parents that they are welcome to call and check on their child at any time. They are also welcome to stop in any time aswell. However most of them don't stop in because they are at work or school... and when they do stop in it makes it harder on the children... because they associate mom or dad comming with going home, and when mom or dad stop in and then leave without them it usually creates crying spells for both child and parent. So i suggest making sure that the center has an open door policy and calling to check on your daughter throughout the day.One warning sign is check how many times your daughter was changed and how often and long she slept and if she is crying every time you pick her up. You should get a paper at the end of the day from the center as to what she did through out the day and how often she was fed, changed, etc.
Good luck with every thing and remember your daughter will "tell" you if something is wrong with the arrangements that you have made. Sorry I was so long winded This is my life passion is to help parents with childcare needs and concerns.