Elizabeth was 13 in 1547 when her father died and her younger half-brother, Edward, became king (aged 9). Although she was quite close to Edward, many people suspected she might be plotting against him during his short reign (he died aged 15 in 1553). However, nothing could ever be proved against her.
When her older half-sister, Mary, became queen in 1553, Elizabeth was again suspected of plotting against the monarch - and again nothing could be proved.
Five years later, in 1558, Elizabeth received word that her sister Queen Mary, was dead. Aged 25 Elizabeth was now Queen of England.