hello and welcome to HCM forum,
I would like to inform you that herpes
virus is responsible for causing herpetic whitlow
on your daughter's finger.Immunization
boosts the immunity and not supress it,
we do not have a vaccine
till date to prevent herpes infection.
Most probably the infection on your daughters finger developed following contact with someone who had herpes or sometimes an individual who has herpes ulcers over his/her lip or in the mouth, if has a finger nail /skin biting habit, the virus enters the broken skin and causes herpetic whitlow.
I would recommend you to see a physician soon,
he/she will prescribe antibiotics and some topical gels to be applied over the finger for your daughter.
i hope i answered your query,
i wish you and your daughter good health.