As of now, I think what you gain in the short term (1 less resource and + 1WP) is not worth the long term sacrifice. Since she gives you an advantage over another silvan only if you use her to chump block soon thereafter, if you do not need to do so the round she enters play you'll have to choose between avoiding "silvan leaves play" events (or not, but at the cost of losing an ally, which is bad) or having to refrain from using her for questing.
I see what you're saying and definetly agree that the first rounds are critical.
Since card draw with silvans is less of a problem she might be worth the deck space just to have to possibility to play a cheap ally T1 (even though 1 additional WP is not much important considering Silvan decks usually run Celeborn + Mirlonde / Haldir / Elrond, all high WP heroes).
Maybe she is useful in scenerios such as Into Ithilien which feature a tough enemy right from the start in the Staging area, however I think if you're engaging such enemies with Silvan from T1 you're going to have a hard time: since attack power is low, it will take you multiple turns to dispatch him while having to suffer a 1-ally drain for every attack + possible additional shadow effects.
The strategy I use in my deck for dealing with early enemies is always trying to avoid combat. If it is not possible, I am more than willing to keep a hero (mainly Elrond) back to defend unless the enemy has an extremely high attack value (5+), but usually such enemies have high engagement costs as well.
However I think I'll give the Refugee another try just to see whether her cheap price is worth the drawback.