Thank you for your query,
How is her activity, feeding and urine output and her weight gain? If these are normal nothing to worry.
Reaspiratory variation is normal some times low in sleep and increased during alert and excited stage and it usually vary between 40 to 60 /minute.
But persistent high respiratory rate
Consult your Pediatrician
to discuss these issues, for complete examination including cardiovascular and respiratory system to exclude any problem.
Hope I have answered your query.