Should I be concerned about her weight?

Anonymous
My girlfriend is a bit underweight but she is trying her best to eat more, she looks a lot better than when I first met her, but she still sometimes gets dizzy or feels faint, like recently, she was laying in bed and she sat up to hug me and all of a sudden she went floppy, so I laid her down & checked her pulse to make sure she was okay, and after like a second or so she was okay but not 100%. Do you think it's down to her being underweight?
Should I be concerned about her weight?
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