I shouldn't worry, I had a bottle fed ewe lamb who every time I got near the flock she would bleat, run over to me and would not leave me alone. She is now a 3 year veteran mother but will still come to me for a bit of TLC. I went up to see my ewes yesterday and sat in the middle of the 4 acre field and guess who came to see me, only problem was she brought the other 40 with her and i got mobbed.
Mine got less dependant when I wasn't entering the field every day, i used to inspect the sheep from behind a hedge until that bond was broken, just like a lamb to a ewe.
She didn't care for me much at all once I put her to the ram, I think he made a woman of her!