Don't obsess over freezer stash. Enjoy a night out with your husband.
This.
At the very least, BF her right before you leave and go out to dinner somewhere that won't take 3 hours. She can go 2 hours without eating if you are that worried about your freezer stash.
YES GO. Ditto PPers on BFing right before you go and babystarry will probably be fine for 2 hours. DS is fine for 3. DH and I do this often. I nurse at 4:30, drop DS off at my parents house, we have dinner nearby and pick DS up at 7 and are home in time for his 7:30 nurse then bedtime.