Friends: Silhouette is slow to warm up to new ponies (or other sapient beings), and maintains a cool, comfortable distance at first. And that's where most stay. She likes to keep friendly acquaintances, after all. But if you're patient, get along well, and give the bond some time to take shape, she'll be attached for life.
On a day-to-day level, the change from acquaintance to friend marks a significant rise in openness and humor with Silhouette. She doesn't generally laugh loudly or joke around in front of just anyone, and can actually be remarkably sweet when the situation calls for it or the mood strikes her. But you wouldn't know any of that if you weren't already close.
Enemies: Like with friends, Silhouette doesn't do half measures. It takes a lot for her to really make a nemesis out of someone—like a betrayal, a very personal attack, or worst of all, hurting someone she cares about. Once you manage to get on her bad side, though, you're stuck. She's not quick to forgive or forget.
If she's decided you're awful enough, she isn't exactly going to hound your every move, but you can bet she'll meddle if she sees some way to do it without acting "unbecoming of a Guard" or some equivalent. She's not willing to lose her job for an enemy.
Lovers: It's never happened before, and she honestly hasn't put a lot of thought into romance. It was just never made a priority. She's married to her job and that makes it hard for her to make someone happy like that.
The Fun Has Been Doubled! is a My Little Pony: Friendship is Magic moderate-to-advanced forum roleplay. Set after the events of the fifth season, we currently have no overarching plot. Instead, we simply have created the world of Equestria for you as a giant playground to have fun in and to explore the magic of friendship. Canon characters and original characters are available for you to play as, both ponies and non-pony species alike! Just remember that we are account-per-character and we'll be fine!
So why don't you stay for a while, look around, and let us know if we should get a welcome party started for you.