Unfortunately, peanut allregies are becoming more common by the day.  My son was daignosed at 21 months of age with a severe peanut and tree nut allergey- found out when  gave him his first taste of peanut butter and his lip swelled up to his nose. 

Have you had your toddler seen by an allergist or just diagnosed at Children's?  I suggest seeing a pediatric allergist who will be able to provide you with a lot of information and test your child for other allergens to ensure his/her optimal safety.

We carry Benadryl and epi-pens where ever we go.  My son who will be 5 in August has never experienced a reaction so severe that he's required administration of the epinepherine, but I believe that is due in part to my always having Benadryl available to give him at the first sign of any type of reaction.  I am very vigilant about what types of foods are in our home (no nuts, nothing with nut oils, etc...) and for the first year or so drove my friends and family NUTS (until they 'got it') about what could and could not be around while my child was in their home.  I always bring safe snacks for my son (even to birthday parties).

There are a couple of support services available on the internet and one local organization that does monthly discussions and sends out updates.  Unfortunately I'm at work and don't remember the web site off the top of my head.  But if you are interested, let me know and I'll dig it up this weekend.

Peanut allergies are scare and the more you educate yourself, your family and your friends, the safer you child will be.

We're fortunate that my DD hasn't shown signs of allergies like that, but we try to avoid peanuts anyway.  So, not PB and J's in our house - we use sunflower seed butter.  Tastes the same, better for you, and not a tree nut.  You can find a lot of other options and allergy-aware food labels at health food stores and organic markets.  Schools and daycares are getting more aware, too, and a lot of them are peanut-free these days.  When your toddler is visiting others, make sure parents and families are aware of the allergy and take it seriously, and keep an epi-pen with your daughter at all times.  You're not alone - there are probably some online support groups you can look into, as well.