Hi,
I'd say [mila] because it's more or less the way I'd say it in Italian. And in English? I dunno! I really don't know! There are no rules to pronounce words in English, so if I had to read "Mila" I'd probably say either "mil-uh", "mil-ah", "me-luh", "me-lah", "my-luh", or "my-lah". Wanna know the first that would come to my mind? Probably "mil-uh"...
Wait for some native speakers now...