I don't see Roseanne deleting tweets as an issue.
She knows what she is doing.
The attention to what she tweeted is still there.
People screen capped the tweets.
People are still talking about it [tweets, info and Q]
It kinda like when Q deletes posts.
We all still know what was said.
Same with Roseanne.
In regards to her possibly being threatened - Trump supporters are threatened all the time.
Day in the life of supporting POTUS