https://en.wikipedia.org/wiki/Legal_drinking_age
Seventeen states (Arkansas, California, Connecticut, Florida, Kentucky, Maryland, Massachusetts, Mississippi, Missouri, Nevada, New Hampshire, New Mexico, New York, Oklahoma, Rhode Island, South Carolina, and Wyoming) and the District of Columbia have laws against possession of alcohol by minors, but they do not prohibit its consumption by minors.
Fourteen states (Alaska, Colorado, Delaware, Illinois, Louisiana, Maine, Minnesota, Missouri, Montana, Ohio, Oregon, Texas, Wisconsin, and Virginia) specifically permit minors to drink alcohol given to them by their parents or by someone entrusted by their parents.^[citation needed]^
Many states also permit the drinking of alcohol under the age of 21 for religious or health reasons.
If you're in one of the above states, it's probably fine as long as you're with her. As a backup, just invent your own religion that has a special ceremony at age 5, consisting of this exact meal, with wine.