Questions & Answers about אני לא יודעת הרבה עליה.
Because יודעת is the feminine singular present form of to know.
So this sentence is spoken by a female speaker: אני לא יודעת הרבה עליה
If the speaker were male, it would be: אני לא יודע הרבה עליה
Hebrew present-tense forms usually show gender and number, but not person.
In many cases, אני is helpful and often expected in the present tense.
That is because יודעת by itself only tells you feminine singular, not whether the subject is I, you, or she. So without אני, the meaning could be less clear unless the context already makes it obvious.
So אני לא יודעת הרבה עליה is the normal clear form.