Ciao from NYC!

Donatella, welcome! I understand your concern about your daughter's development in English, but I suspect that this challenge will be overcome reasonably soon and without any enduring effects. So, while I know this is a frustrating time for her and for you, the fact that you and your husband have been so proactive in nurturing a firm foundation in your two minority languages is still, I think, quite beneficial for the larger arc of your trilingual journey together.

Because it sounds like her bond with you and your husband has been established in Spanish and Italian, respectively, it's not surprising that she would resist the idea of communicating with you in English. Of course, I can't really judge the extent of her development in this language to date, but if she's been attending preschool full-time since September, she likely has acquired a good level of passive ability and it's only a matter of time before that passive ability grows more active. (I don't know how much insight her teachers have offered about her use of English at school, but it may be that she's actually more communicative there than she is at home, which means her progress could be underestimated. But even if that's not the case, it's important to remember that she's still quite young and the months and years ahead will surely make a tremendous difference in her development.)

In the meantime, if you feel she needs additional exposure to English, beyond her time at school, you may want to hire a friendly college student to play with her on a regular basis. This sort of one-on-one input, and interaction, could strengthen the pace of her progress and help her become more comfortable communicating in English.

In the long run, Donatella, I think you'll ultimately look back and see that this stage was short-lived and only a minor setback on a very successful trilingual adventure. So keep moving forward, with loving patience and persistence, and add playful opportunities for her to engage in English with others if you and your husband (and her teachers) think this would be helpful for the continuing growth of her ability and her confidence.