The MRI machine in Eloise's home would have pulled the bicycle and other nearby ferromagnetic metal items towards it's extremely powerful magnet in a dangerous fashion at the moment it was turned on. Even non-ferromagnetic metals can interact with an MRI ( such as her earrings) in such a way that the MRI image produced would likely be distorted.
Ashby talks about when his 19 year old daughter died, but the tombstone earlier in the movie shows us that she died when she was 18.
Ashby's daughter was one month short of her 19th birthday. Therefore, she was only 18 when she died. The script was correct.