Its good to start learning about how to deal with this comments.
I am one of the ones that hates hates hates this aspect of weightloss.
I have found through the years its best not to discuss numbers-tell people you're not sure-you don't weigh -whatever.
While I don't believe 'everyone' is intentionally mean, I do believe that people like to keep order around them and don't like change. They will therefore do their best to keep the status quo.
Her comments were probably made with the intent to discourage you from weightloss (whether she is aware/unaware of it).
I have found that for me, in the past, my weightloss would stall or rebound when dealing with this commentary.
Back to my original statement. Accept the comments as a reality, do your best to cope with them, and expect them to come fast and furious as you get closer to your goal.

Ignore her or laugh inside 