Hi L.,
Sorry to hear about your daughter's recent diagnosis. Of all the food allergies, I believe that peanut is one of the most dangerous. Did her doctor/allergist prescribe an EpiPen Jr. for you to keep just in case?
If you have never been a mom who reads food labels, you will be now. You need to watch out for EVERYTHING. My daughter was diagnosed at 1 year old with a peanut allergy (she's also allergic to wheat and eggs).
You''ll find a weath of information if you visit the Food Allergy & Anaphylaxis Network (FAAN) at www.foodallergy.org. There's alot of great information out there.
All FDA-regulated manufactured food products that contain peanut as an ingredient are required by U.S. law to list the word "peanut" on the product label, so that should make it a little bit easier for you when you shop. Don't buy anything that says "shared on the same equipment as..." or "produced in the same facility as..." because then concerns about cross-contamination arise.
You'll want to avoid all nuts ~ tree nuts included, because often they're produced in the same facility. Nougat, African and Asian foods (especially Chinese, Indian, Indonesian, Thai, and Vietnamese), and Mexican dishes.
Be vigilant when you go places. You may want to call ahead and make sure that it's a safe environment (allergy-wise of course).
Your doctor/allergist should also be able to provide you with written information about the allergy. If she's merely seeing a pediatrician/family practitioner who doesn't normally deal with food allergies, please find an allergist.
This was quite wordy, sorry, but I do hope it's what you were looking for. If you should want to ask any questions, please feel free to e-mail me.
God bless and I pray that you and your daughter, along with the rest of your family, are well.