Oh thats no good, poor Bella. My DS had bronchiolitis 5 times in 2 years before it was finally diagnosed as asthma. If she gets too bad you can take her into a steamy bathroom (close the door and turn the hot water on so the room goes steamy). If she gets sick of drinking water you could always try dialuted juice for a bit of flavour. I would maybe steer clear of giving her too much dairy (aside from her milk bottles) cause it might make her more phlegmy.

Good Luck xx