Desperate to translate this saying from my deceased grandmother

My grandmother was a sweet hearted angel originally from Abruzzi Italy. When I was a toddler (probably 2 or 3) she used to call me a term of endearment that she used throughout even my adolescent years. I am not sure how to spell the word in question, but it goes something like this: BELL EET SA di nonna. I spelled it how it sounds. the B word is where I am stuck. I tried every free translator and no luck. I was told by family members that it was just "slang" which roughly translated meant I was the apple of her eye, her pride and joy. I am making some home made wine from her family recipe and would love to use a photo of her and I with that caption. I appreciate any help you can offer.
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