E.A.
Chickenpox is highly contagious. I would call your pediatrician and give them a heads-up that she has been exposed. Plus, make sure you and your husband have either had the pox as children or get a new vaccination... Its way worse if adults get it... facial scarring, etc. Most Urgent Care Clinics should be able to do a blood test to confirm whether you or he has immunity. (Side note: My MIL doesn't quite remember if my husband had the chickenpox or measles as a kid...!)
Hope the info on this site helps: http://www.askdrsears.com/html/8/T083400.asp
By the way, it says that 1.) Breastfeeding will help provide your baby with some immunity and 2.) infants 2 months and younger comprise the critical age that need to avoid chickenpox. Below are some key details from that link. (Good luck!)
HOW DO I TELL IF MY CHILD ACTUALLY HAS CHICKENPOX?
It starts off with a few red spots or bumps (often mistaken for insect bites). Fever is common. The next day many more bumps will appear, and the first bumps will have turned into blisters. On the third day, more new bumps will appear, and the second-day bumps will start to blister. On day 4 the original blisters will start to crust over. Usually by day 5, no new bumps will appear, and more blisters will crust over. By day 7, most or all of the blisters will be crusted over. The fever can last for 5 days. The total number of spots is around 200 on average.
The key to diagnosing chickenpox is to watch the progression of spots from bumps to blisters to crusts, and to have a mix of all three types during the illness. Very important note – it is nearly impossible to diagnose chickenpox on day 1, and still difficult to know for certain on day 2. Therefore, do not bring your child into the doctor on day 1 or 2 and expect a definite diagnosis. If you think its chickenpox, then quarantine your child until day 3. If the spots have progressed as described above, then you probably don't even need a doctor to confirm it.
Dr. Sears suggests: If you suspect your child may have chickenpox draw a circle around a few of your favorite spots. If they all become blisters within a day, they are probably chickenpox. If they don't change dramatically then chickenpox is unlikely.
HOW DID MY CHILD CATCH CHICKENPOX?
It is passed through the saliva, coughing secretions, and direct touch. In general, you must either be living in the same house, or play indoors in close face-to-face contact for more than 5 minutes, or have close face-to-face or physical contact outdoors in order to catch the illness.
MY CHILD WAS EXPOSED TO CHICKENPOX. HOW LONG UNTIL HE MAY BECOME SICK?
The incubation period (the time from when your child is exposed to the time he will break out in spots) is generally 14 days. It can be as early as 7 days and as long as 21 days. If three weeks pass from your child's exposure, than he is in the clear.
GIVING THE CHICKENPOX VACCINE AT THE TIME OF EXPOSURE
For children and adults with no history of the illness or vaccine, giving the chickenpox vaccine within 72 hours of exposure (before you even break out with the rash) has been shown to either prevent or decrease the severity of the illness. If more than 3 days have passed since exposure, it is probably best not to get the vaccine then.