How old is she?
My 9 month old English cocker does this every now and then. He is just playing. Same thing with the reflection and occasional objects. He's not at all a fearful pup. These behaviors have a lot to do with just discovering the world, too.
Until he turned about 5 months old, he would be a totally different dog on our bed. Nipping, barking, digging, acting crazy... and even though we wanted him to sleep with us, he much preferred the floor or a basket. I even started my own thread here about it!
I think it has something to do with the amount of your scent that's in the bed, plus maybe some innate things that have to do with playing with his position in the family. I'm not completely sure. In any case, he has just grown out of it and adjusted with time... for the most part! :)
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