Apparently, the woman is involved in the process with the marriage tribunal. Thus, it is reasonable to believe that she believes subjectively that her first marriage was invalid.
In that she has submitted her case to the Church, and has explicitly and rather publicly committed to accepting the judgment of the Church, it isn't unreasonable for her to hold to her subjective opinion until it is replaced by the determination of Objective fact.
She abides by the teaching and discipline of the Church by abstaining from Communion until there is a ruling one way or the other, but until the Church tribunal were to uphold the validity of the first marriage, I think one can make allowances for someone in objectively doubtful circumstances.
Should she find herself with a ruling of validity rather than of nullity, it would be incumbent upon her and her putative "husband" to do their best to follow the path that you have laid out.
sitetest
Good explanation. Thanks.