Berelinde, am I right in thinking that Tessa and Rael could head Beldin's scream? (With a TN of 5, Rael literally can't fail the check.) If so, can I see what's going on from a window? Are the windows glass or just open?
Ideally, I'd like Rael to be able to shoot her crossbow from the window at the wolves. Just wondering if that's a possibility. I'm assuming my first action would just be to look out the window. After that, when would she get to attack, since her crossbow is already loaded?
Thanks 
If you literally cannot fail a test with a TN of 5, there is no need to roll, but you will need to roll initiative to determine your place in the combat order.
You are allowed one major action and one minor action per round. Beldin would have yelled at the start of the round, more or less (the wolves' initiative was 19 on a 3-18 scale), so Rael will probably have about as much time to act as anybody else. She will have to move to a window and prepare a shot, so she will not be able to fire until round 2. If her crossbow is loaded, which would have had to be announced at some point before now.
It is conceivable that she was walking around with her bow at the ready. Did you post that she was? (I'm not being a wiseass. I really don't remember.) If she were walking around with a cocked crossbow on her back, the danger of accidentally shooting herself would be extreme.
If you did post that Rael had her weapon at the ready, drawn, or otherwise loaded and in her hands, then she may open a window and fire next round. Four wolves are attacking Bartha's team, but there are six more around the back of the house. The windows are shuttered, but unglazed. If Rael did not have her weapon drawn and ready, she will have to take a full round loading her crossbow, firing in round 3, but she may go to the window and peer out to find a target. If the wolves move away from the back of the building (which will happen if the wolves in front of them die and make room or if the attackers push out into the open grass rather than maintaining a choke point), Rael will have to leave the house to continue the attack.
The damage from a heavy crossbow is impressive, but it is slow.
I'll wait to post then, till berelinde has a chance to answer this. I also assume, then, that Rael will be able to react faster than Tessa. 
If Tessa fails her roll, unlikely as that is, she may react to Rael moving toward the window, if nothing else.
You need to roll initiative to determine how fast Tessa reacts. But no matter how fast she is, she is still outside melee range. She might jump, but I'm not sure she wants to land feet-first in a pile of wolves. They would certainly be surprised, but there's that whole thing about jumping out of a second story window thing... 