"She was so pissed off by the negative comments that she stopped streaming."
"She was so offended by the negative comments that she stopped streaming."
"she was so pissed off that she ~" 「彼女は腹立て〜」
"pissed off" の代わりに "offended" や "annoyed" も言えます。
"by the negative comments" 「不愉快なコメントに」"negative" の代わりに "rude" や "bad" 、"unpleasant" も使えます。
"she stopped streaming" 「ライブ配信をやめた」"she stopped the live stream" も使えます。