It's a pretty typical contrived move to try to generate buzz around the character.
I like Ms Marvel in concept, because it is cool to have a Zoomer Muslim superhero; it's a new, fresh idea... but the version in the comics has always been... a bit weak? My partner is actually Pakistani and raised Muslim, much like Kamala Khan (just British Pakistani rather than American), and enjoyed the character in the Marvel Rising animated series, and the live action Ms Marvel series too, but could never get into the comics, because to them, they never quite felt real; having been created based on a white muslim convert's perceptions of what growing up as a pakistani girl in a western country might be like, rather than lived experience. The writing teams on the shows being more diverse made the character more believable.
There was a big surge in interest when Ms Marvel initially released...and then it died down because... well, it was never a bad book, but it rarely had big, exciting stuff happening. Kamala lacked both the authenticity to maintain the interest of zoomers or south asian readers, and the strong plotlines to keep general comics readership engaged. I read the series for a volume or two, but it always felt like a string of episodic, low-stakes adventures where Kamala tried to balance teen life and dealing with these minor, disruptive villains.
Really, it's just an overall weakness of Marvel comics, that they insist on having these really long-running series, where they kind of rely on people buying them out of habit, and where large status-quo changes only happen as big events, and the characters are treated like trademarks, or handed from writer to writer, so their character development is often limited, and the status quo is always resetting. It may have been a viable business model back in the day, but floppies are so expensive now. I'm not spending £3+ a month on 22 pages of just the same old stuff again interspersed with ads! Kamala being targeted as the audience that reads manga and webtoons just makes the problem worse, because it's just not going to feel like good value to them.
...So Marvel are doing the one thing they know will draw media attention to a character. Killing them. In the hope that people who've been tuned out of the series, where very little happens, will all read the comic and make a fuss like "NOOO! You can't kill Kamala!" and then, like basically every Marvel character, she'll come back to life via contrived means, probably in whatever series they're trying to sell (probably something that ties into a new live action series or movie. My personal bet is Young/New Avengers. I think we're going to get a Young Avengers team with America Chavez, Cassie Lang, Kamala Khan, Wanda's kids etc. in the MCU). And then they can be like "Look! She's back! We did a good!" ....Same old, same old.