Honestly its rude to be invited by a country to meet their president who decided to respond to your criticisms of their administration only to not show up and go meet the opposition.
Being invided and then no showing shows complete disregard to basic diplomatic Etiquette since it was a mission to show solidarity against the embargo
Bonus socdems being cringe part 4.5: about another member that didnt show up to the presidential meeting
Deeply unserious people
To your first point, it seems as though her main complaint was there wasn't much of a way to dialogue with both party officials and the critical left she talks about.
To your second, no one likes when someone they know and respect is being fed-jacketed.
How useful her critiques are when even the non-government critical-voice she talked to (Maykel Vivero) said:
the most systemic change must happen through a change of policy in the United States. Absent that, the most likely possibilities for Cuba’s future would be 1.) a Chinese-style mixed economy, which would significantly increase inequality and leave workers without a democratic voice, or 2.) a full capitalist restoration, which would be a world-historic disaster for the working-class.
I think even she doesn't really see the realities, considering she thinks Cuba's standard of living can be raised and there can be less discontent if more voices are heard.
She wants the support to be more critical, but considering how bad the embargo is (and everyone in her group and the Cubans she talk to agree about), it seems as if this is largely a pointless exercise. No government is perfect, but what can you do from America where more people are pushing for an overthrow than an embargo lift. Weird not to mention Allende in this whole discussion too.