How do you get antibiotics into an elderly person who has a UTI but isn't eating and therefore throwing up the pills that were given?

I'm sitting in the ER with my grandmother who apparently hasn't been herself for over a month. We just flew her back from Florida and brought her to the ER and they did a bunch of tests and then diagnosed her with a UTI. They gave her a prescription for antibiotics but she isn't eating or whatever she is eating she is throwing up so she isn't keeping the pills down. She's slept all day and the brief time she is awake, she is talking crazy stuff and not making any sense. And today she coughed up blood. So we brought her back to the ER. I really think she needs to be admitted and get the antibiotics through an IV. I'm hoping if she gets rid of the UTI then hopefully she will get back to her normal self again.