Hi, not discouraging further contributions here, but while you're waiting, you might be interested in these earlier answers

• /u/neverwasahat in [How did Queen Elizabeth I go from being hell-bent on killing Mary, Queen of Scots to naming her son James as her successor?] (https://www.reddit.com/r/AskHistorians/comments/67dc6n/how_did_queen_elizabeth_i_go_from_being_hellbent)

• /u/RTarcher doesn't go into much about Elizabeth's motives here, but you may find this additional context of tangential interest [Questions about James I and VII involvement with his mother's (Mary, Queen of Scots) execution] (https://www.reddit.com/r/AskHistorians/comments/78g8b8/questions_about_james_i_and_vii_involvement_with)