personally, i believe that the younger they are exposed to another language the easier it is for them to pick it up.

we had a similar situation at our house, but hubby was supposed to speak cantonese instead while i spoke english.

both of my kids have been exposed to a mish-mash of languages. i speak english, hubby speaks english/cantonese, helper speaks english/cantonese/tagalog, grandmother speaks cantonese with a hakka accent etc.

i have found that the kids use english more often as the language of choice, but they have the underlying understanding of chinese in order to be able to go to local school.

so.... to make a long post, ummm.... less long.... i would say, it wont' hurt if you take your baby to an english playgroup. she will soon develop the ability to differentiate the sounds of the two languages.

good luck!