A volunteer representative of the HOA should have no trouble contacting HOA members to attempt to have the homeowner pay, but in order to attempt to legally collect the HOA will likely need to hire an attorney and file a lawsuit to get a judgment before any further steps can be taken. You should also consult with your HOA bylaws. Often the only recourse for HOA fees will be to place a lien on the property for past amounts that won't be collected until the house sells. A local real estate attorney will be able to better answer questions as to issues with your specific situation.
This advice is for general purposes only and does not establish an attorney-client relationship. Your situation is complex, and nothing you are going to learn online can possible address your needs sufficiently. You should seek counsel from a licensed attorney in your area before you take any actions.
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