Yes, she can be pregnant through this type of sexual activity even without penetration. Though it is completely depends on her ovulation time/ fertile days.
Here, I suggest her to wait at least 7 days for period and if she does not get it, she must do a home pregnancy
test or blood for beta HCG
test to confirm pregnancy. After getting result, you must consult with her doctor for suggestive measures.
In case of negative pregnancy test, she may need to proceed some other investigation like USG lower abdomen, thyroid
profile and other hormone assay to rule out underlying pathology.
, take healthy diet with iron supplements
, control body wt, maintain genital hygiene and take a sound sleep.
Be well and take care.