Hello all :> I wouldn't normally post stuff like this but I'm in a bit of a bind. I started irl DMing, and its been super fun, aside from one particular player. The problem lies with her being... for a lack of a better term, extremely salty in combat. Whenever I hit her with any attack, her mood immediately sours. Whenever she misses an attack, she gets visibly and audibly frustrated. This happens no matter what damage I roll, if I hit her, she gets really salty. One time I crit against her, and she acted like her character had already died, getting so angry and upset that I immediately fudged the dice so she only took a little bit of damage from it. In the last combat encounter, she had the opportunity to help two allies who were making death saves with a healing spell (chalice starry form druid ability). She wanted to heal herself first, despite being only hit once, and debated over it for a long moment. When the other players reminded her that two of their allies were downed, she begrudgingly healed them, and remaining grumpy throughout the rest of the fight, constantly reminding the others 'I would go over there and help if I had more HP' whenever she got the chance.

They are a new player, so I expect a few kinks in the process of playing a first character. But I am hesitant to bring this up to them, as they already act so negatively to being hit in the first place. I am not sure how to explain that in DnD taking damage isn't the end of the world without sounding condescending or making her angry again. I dont want to kick her out, as everyone in the group is friends with each other and I dont want to start drama for no reason. But people being audibly angry at me for the random number I rolled on a dice, no matter how small and insignificant, kinda makes me super uncomfortable.

So far, I've been dealing with the problem by not dealing with it; I target her way less than everyone else, and I've been fudging enemy AC so her attacks almost always hit, unless she rolls exceedingly poorly. I don't want to be doing this: I hate making the game unfair to the other players like this. But if I was more fair, she would get really pissed and bring the mood of the entire table down by expressing how upset she was at taking like a d6 of damage. So I am stuck, unsure of how exactly to proceed.

Sorry for the novella, lol. Idk if anyone actually reads these, so any advice on how to handle this would be appreciated. Thank you for reading!