Nocturne, just adding another couple of pennies of my own. Like Heidu said, it sounds like your wife has issues of her own, like depression. If she has a physical disability and you have been a support for her, then she may well feel threatened and afraid of abandonment. At least, it sounds that way to me. She may be reacting to the situation from fear and maybe some hopelessness. Sounds like she is depressed, too. From what you've said, this has been going on for some time and the both of you could very well be exhausted emotionally. That creates even more depression.
I'm with Lady D. Leaving a child unattended while you take a nap is child endangerment! Is there a grandmother or a trusted friend who could watch your little girl for you? Maybe if the three of you spent a weekend alone, away from each other, you could get some rest from everything and come back somewhat refreshed.
I can feel your need to hang on until your next couples' meeting. When it comes your turn, express your feelings by starting out saying "I feel..." Don't accuse your wife of anything. Keep it personal. Example: "I feel very concerned and frightened to know that my daughter was left unattended for ... (however long it was.) ... I feel panicky and dejected/rejected when I'm asked to leave on a moment's notice. ... I feel ___ when I don't have anywhere to go."
Good luck. We're all pulling for you.
<font color=blue>Don't die with your music still in you.</font color=blue>
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.