As you said - velcro. Which is very cool, but man it can get crazy sometimes. Like when they stick their head in the shower, then you have to laugh when hey get a face full of water and get that look.
Has something happened in the backyard to scare her? Any wildlife?
Without being home when she gets on the bed, you can't redirect or correct it. Close the door to avoid it. Same with the trash. If you aren't there to correct, put the can in the pantry, closet; just where she can't get to it.
I am concerned about the snarling and getting in between anyone and the kids. If there isn't a threat, it would be appropriate to be watchful, but not snarling.
I am also concerned about what you describe as moan growls at the 2 year old. What is happening when this occurs? Is it random? Is the 2 yr old being a typical 2 yr old and curious yet just not quite sure how to interact with a dog yet? Definitely get a trainer involved in this to get eyes on what is happening. Monitor ALL interaction between the baby and dog. Family Paws-New parent classes dog and baby
can give you some ideas and also provide a list of trainers.
As for. The. Backyard. We live in the country so yes there is wild life. Never been an issue. She loves the cows and other then that there really isn't anything.
When I say snarling I must redirect that because re reading it isn't correct.
She growls and barks when someone comes into the yard, if the kids are outside she makes sure to place herself between the stranger and the kids. And growls and barks until I say stop. Then she just barks or groans never leaving her alert.
With the two year old, she is going on 3 and is very smart. She doesn't hit the dog or climb all over her. It is more or less so if the dog is sitting or something all my kids except my youngest can wrestle her attack her and do whatever they want. Ages 6 3 and 2. So there isn't much difference.
She still protects them all equally and has never shown teeth to my kids.
She doesn't usually show teeth except for 2 select people she just absolute hates. She will not attack unless I command it. She watches people like a hawk until she sees I deem them ok. Watches my hands and body it is weird! As well as them.
As for the sleeping in tiny areas?
She is very submissive to my wife and I but not so much anyone else.