13 month old pulse high ?

We went to the ER about 2 weeks ago for wheezing . She got X-ray on lungs they didn’t see anything but still heard fluid in her left lower lung . They gave her amoxicillin and we went to a follow up appt yesterday. Well they’re saying her it’s crackling all over and not just in one spot . Now they’re saying it’s bronchitis and it’s just gonna have to go away in its own .. well this morning my mom told me her pulse was very high (she has her bachelors in nursing) doctors never mentioned it to me . But I don’t remember all the way but I believe she was crying or moving around when they was doing her vitals . Can that be the reason why it’s high ?