Security B&B way :)

I'm going with my friends over the weekend to climb up the highest mountain in Ireland - Carrauntoohil. I volunteered to book B&B. I sent an email to a few B&B owners and waited for a reply. Majority of them were booked out but one woman offered a family room for us. The interesting part of this story is how she wanted me to send my CC details. Below I show the best snippets from the email conversation.
The women:

"(...)Please give your cc number and expiry date if you wish to secure the booking.  Cash is paid on morning of departure."

Me:

"Is there any website that I can use to book the room? Sending CC number in an email is not secure. Emails are not properly secured and encrypted"

The women:

"People usually send 2 emails with half the number on each"

Just brilliant :)