Don't beat yourself up - it can happen whether you're there or not.
From what I've seen, it's not always (or even usually) necessary; but it depends entirely on exactly which illness and medication.
If you have an eye dropper, you can try to get some fluids in her that way. As I recall, if you don't have specific vitamins/electrolyte solution, you can just use pedialyte or even gatorade. (someone correct this if it's inaccurate, please.)
From what I've seen, it's not always (or even usually) necessary; but it depends entirely on exactly which illness and medication.
If you have an eye dropper, you can try to get some fluids in her that way. As I recall, if you don't have specific vitamins/electrolyte solution, you can just use pedialyte or even gatorade. (someone correct this if it's inaccurate, please.)