If I fucked her, would she die?
No. She just has an untreated stomach ulcer. Sex would be fine so long as you weren't overly rough with her.
Give her some Pepto Bismol and some antibiotics, and she'll recover in no time
For over 300 years doctors assumed stomach ulcers were caused by stress, and were "incurable" but manageable by reducing daily stress levels. It wasn't until about 15 years ago that some dudes discovered the bacteria that causes most ulcers.
Even so, it's still a pretty common misconception that ulcers are stress related and incurable.