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Hello and thank you for using this site to help you. Rescues are often anxious and fearful and she may be acting out when company is there because of being anxious. Dogs that are rescues may also have grown up in a puppy mill which means that food was tossed in a crate that held many dogs and may the best dog win as far as eating and this can lead to counter surfing and trash eating.
Also check the food you are giving. make sure the quaility is good and add fillers such as canned pumpkin, carrots, green beans to give her a full feeling.
You also want to check that the thyroid is okay as this will make a dog feel hungry all the time.
For anxiousness you can try things like melatonin to calm her, an anxiety wrap , play calming music in the cd player and do some behavior modification training as well as train daily in short sessions several times a day because this boosts a dogs self esteem which helps in behavior.
As for the fatty tumor, though they are usually harmless ,as they get bigger they can cause discomfort when sitting or laying down so it is always best to discuss this with your vet as whether it should be removed.
Melatonin found in drug stores by vitaminshttp://www.petplace.com/drug-library/melatonin-melatonex/page1.aspx
calming music on youtube to try out
There is a medical such as thyroid but there is also canine cognitive dysfunction and this is much like the onset of human dementia which will suddenly show a dog revert back to behaviors or start new behaviors. You are describing a dog with anxieties , ie : won't go on wet grass, shakes with noise, etc. As dogs age other behaviors can creep in from a manifestation of original anxieties,
As for getting into garbage since you know she does it, then it is best to put your garbage in an area she cannot get to it at all as it is not likely to stop overnight and may in fact get worse so keeping her safe is priority.
Anything non food has the potential to cause a blockage of the intestines so if she swallows plastics, Styrofoam etc, you need to watch if it passes and watch for signs of obstruction which would be sudden lack of appetite, vomiting, diarrhea and lethargy. Grapes are toxic to dogs as are raisins, so if the dog ingested any grapes from the vine Vet help should be sought immediately.