Is she drunk? Or did she see something horribly embarrassing?
Drunk 
She's not much of a combat pony is she? She looks to be more of a character who follows along to stay alive and drinks to forget the pain...
She knows whats shes doing (ôwô)>
She drinks if shes bored actully & it makes her more confident in combat...... maybe to confident.
She drinks if shes bored actully & it makes her more confident in combat...... maybe to confident.