Hi Golondrina. Welcome to TCS!
It could be due to the fact that you're the one feeding her - being the regular feeder for a cat is often recommended as a way to speed up the building of trust between you and the cat, so she's very likely associating you with something she really enjoys: food! 
Some cats also bond to certain people quicker than others. Our Cotton
was my cat from the moment we first laid eyes on him and our Sybil is currently my husband's cat - sometimes they just click with one person faster then another. It certainly doesn't mean she'll never reach the same comfort level with your husband, just that she grew comfortable with you first. If you'd like, you can try having him feed her 1/2 of the time and see if that helps speed up the bonding process.