Sally Jones, dubbed "Mrs Terror" by the British media, has been using social media to make a series of threats against the West using a variety of aliases such as Sakinah Hussain and Umm Hussain al-Britani.
Now Jones, whose husband was killed in an American drone strike, has suggested she might be planning a suicide mission after praising Hawa Barayev who blew herself up in Chechnya in 2000, a report in the 'Daily Express' said.
She said Barayev was a martyr and ended the post with a heart.
Jones is currently being hunted by anti-terrorism experts in America after she was deemed a major threat to security.
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She is now on a list of the world's "most wanted" terrorists which means she could also be targeted by a drone strike.
Jones, who once played guitar in the all-girl group swapped her home town of Chatham for Raqqa, in Syria, in 2013 after striking up an online romance with Junaid Hussain, a computer hacker from Birmingham.
If she goes ahead with a suicide mission, it will be the first time ISIS has used a woman as a suicide bomber in the West.
Jones is not the only British woman being hunted for terror attacks.
Samantha Lewthwaite, dubbed the "White Widow", is the 31-year-old wife of July 7 bomber Germaine Lindsay, and is wanted by Kenyan authorities for her involvement in terrorist plots across East Africa.