Conversation so far:
What are Frances Burney's journal-diaries?
Francis Burney kept a journal-diary as a form of correspondence with family and friends, recounting life events and her observations of them.
So Frances Burney never actually sent the letters from her journal diary?
Are there any other interesting aspects about Frances Burney's journal-diary?
Frances Burney's diary entries suggest that she had begun to feel pressure to abandon her writing.
Why did Frances Burney feel pressure to abandon writing?
Frances Burney's writings were possibly something unladylike that might vex Mrs. Allen, her father's new wife.
Did Frances Burney not like her stepmother?
The Burney children found their new stepmother overbearing and quick to anger, and they took refuge by making fun of her behind her back.

Question: What else is significant about her journals?
Self-contained rewrite: What else is significant about Frances Burney's journals?