Short Answer 
Ellen and Jo faked their deaths to stay safe and continued to combat supernatural threats in season 5. In season 6, they teamed up with Bobby Singer and the Winchesters, receiving crucial support from angels to defeat the Leviathans, which helped restore order.
Ellen and Jo’s Disguise
In season 5, Ellen and Jo did not meet their end at the hands of the hellhounds; instead, they cleverly faked their own deaths. By going into hiding, they ensured their safety while devising a plan to combat the supernatural threats lurking in the world. This strategic decision ultimately allowed them to continue their fight against evil.
Alliances and Teamwork
As they transitioned into season 6, Ellen and Jo teamed up with *Bobby Singer*, a formidable ally in the battle against malevolent forces. Their collaboration set the stage for a united front with *Sam and Dean Winchester* against the powerful *Leviathans*. Together, they formed a compelling alliance crucial to their shared mission of combating these monsters.
Angelic Assistance
In their ongoing struggle, the *angels* also joined forces with the Winchesters, realizing they required help to confront the Leviathans effectively. They provided the group with essential support through:
- *Advice* on how to navigate battles against formidable foes.
- *Supernatural power boosts* to enhance their capabilities during fights.
- Enlisting other allies, like *Crowley* and the demon *Meg*, to tip the odds in their favor.