Pandora, without defending any over-the-top reactions to the "Dubia" you may have noted, I suggest the two cases are not sufficiently parallel for your charge of hypocrisy.

Surely we can agree that the dubia were a direct challenge to the pope rejecting his very careful effort in his document to grant 99% to Burke's vision, and a mere 1% to the more that 50% of the synod that supported Francis' vision. The dubia objected that 99% as not enough! In context, that is a "my-way-or-the-highway" attack; and it was backed up by a threat to launch a formal process to censor the pope.

The Collins thing is different. Marie resigned, and give HER reasons as a perceived lack of cooperation from the curia, especially the CDF. Mueller replied there was no lack of cooperation. So Marie responded with chapter and verse. There is no way a fair minded person can compare Marie's missives as "questioning, accusing and public sniping." It is Mueller who questioned, accused and snipped at her reasons.