was this the first time they've worked together? if so why would she care about being "banished" from the group? if they've been a long time group then why would they discard her for one fuck up? if this isn't the first mistake she's done and this is a common occurrence them yea fuck MC she shouldn't be in the party.
seems really rushed and not thought through more like the author wanted to rush it and get to the real story.
@Doomer doesn't seem like their first expedition together since she says the guys are being more casual than the other days...but it's hard to understand much from just this. Plus honestly the job of healer is to cure but it doesn't mean they should go around recklessly without a care just cause they gonna get healed anyway.
Childhood friend realizes his crush is going to get herself killed, kicks her out of the party for her own safety and makes up a bullshit excuse to hide it.
Just a heads up: Going by the raws, the line on the first page should be something like "We are expelling you from the party." I checked as I was a bit confused at first, wondering what "Bertya" was (a country, city, etc).