Letting her practice her makeup skills on your face? Might feel embarrassing. But you do it, because it makes her happy.

Having "the talk" about underage drinking? Also might be a little uncomfortable. Do that one too.

Over 80% of kids say their parents are the biggest influence on whether they drink alcohol (SAMHSA). So a little awkward now beats a lot of regret later.
Talk to them and let them know you're paying attention and will do whatever it takes to keep help them grow up happy and healthy.