Dog Crate Liners My Beagle Keeps Peeing On The Bed?

My beagle keeps peeing on the bed? - dog crate liners

We have a beagle a year ago. They finally broke the House, but in the last 2 weeks on my bed, peed 3 times viewed. I do not think this is an infection, because it only happens in bed. We have a number for the bed, so that everything can be washed without diving into the mattress, so it should not be able to feel in the same place. and they know it's not really. Tonight, she jumped into my bed, bent down and began to run.
I really do not want to checkout the whole night because it packed during the day and have a dog who sleeps in bed with us if this is really not fair to exclude the binding time. And the other dog has been here for 3 years so it is not new. She is very submissive, do not do it marks its territory.

I do not know what I do now?