Hi. Very difficult to say whether a person has hypertension by a single reading (unless the reading is >180/110)
Check her BP in a calm quiet environment after she has rested for 10 min. Check at different times over one- two weeks. If majority or all of the values are more than 140/90, then yes, she has BP issues.
After vaccination it is usual to have fever headache and bodyache tiredness, which subsides in 48 hrs. It is not clear from your information whether she fainted- as in fell down unconscious. If she had transient loss of consciousness she needs further evaluation
Next Steps
Monitor BP
If symptoms persist for more than three days seek consultation with a doctor