Who was Gulliver's constant companion in Brobdingnag?

From the text:

She gave me the name of Grildrig, which the family took up, and afterwards the whole kingdom. The word imports what the Latins call nanunculus, the Italians homunceletino, and the English mannikin. To her I chiefly owe my preservation in that country: we never parted while I was there; I called her my Glumdalclitch, or little nurse; and should be guilty of great ingratitude, if I omitted this honourable mention of her care and affection towards me, which I heartily wish it lay in my power to requite as she deserves, instead of being the innocent, but unhappy instrument of her disgrace, as I have too much reason to fear.