Another angle this could be viewed from, I think, though, could be Teresa's LACK of a strong, positive ego. Or, rather, that what ego she DOES have is very damaged and crippled.
Look at it this way, for a sec . . .
If Teresa had a healthy, strong, positive ego, she wouldn't give a happy, flying rip HOW much her brother loves Mel or is all over her (as long as they weren't in HER house going at it, that is!). Or, would've --- by now --- realized and admitted to herself that her husband is a cruel, drunken, disrepectful, controlling SOB, and 86'd his ass. Or would've quit hiding behind the Church (possibly and indirectly) and being "old-school Italian" (absolutely, and directly) to try to make excuses for Juicy and his behavior, and duck trying to honestly fix what is so obviously wrong in her life. Or always be trying to showboat in front of the other NJ housewives or outdo them in various and sundry ways. Or continuously always be looking down her nose at them. Or, not wanting them to have any of the spotlight. Or always choosing to read malice into everything they say or do, if it involves her. Or try to play mind games with everybody about how "fine" her life is, when, obviously, those in her orbit --- AND out of it, like us --- have noticed the cracks (Ray CHARLES could see 'em!) and are already (some of them/us, at least), wondering how long it's going to take for there to be a Day of Reckoning in her life when she'll REALLY have to wake up and smell the lasagna.
Just another way of viewing The Problem That Is Teresa and what might possibly be going on --- or not! --- between her ears.