Ima just put this right here:

The Centers for Disease Control has excellent information on vaccinations:
[cdc.gov]

World Health Organization:

[who.int]

How about she sit her husband down quietly, and in a calm and tranquil voice, with sweetest of smile say this.
"Our child will be vaccinated against all preventable and possible fatal or crippling diseases, if you try and stop this from happening, I strongly suggest you never sleep again without a locked door between you and I, Because if you do make that mistake I will cut off your junk with a pair of tree pruning shears.
I are getting what I am saying sweetheart?"
I think he might leave skid marks on his way to the clinic.

Try the CDC web site..simple.

This is a simple pamphlet that is for the layman. Thought this might be a good place to start. If you want something more technical with facts/stats that’s easy as well.
[immunizeca.org]

Thats a tough one.. maybe show her pictures and stories about kids that don't get vaccinated and get a disease

Study - Vaccine Refusal Does Cause Outbreaks
[theskepticsguide.org]

This clip is a good start

You are a good friend. I can't post links but google will give you everything you need.