This dovetails into SE #0 which fills in a lot of details I thought went missing.
1945 - Elisa brings Steve back to the Castle training facility and reunites Steve with his mother. She wasn't killed as we thought. Then Elisa sends Steve to rescue Zemo and then go to Japan to see Kraken. NOW - Maria Hill finds out Steve is Hydra and calls Rick Jones to tell him but as she does she is captured by Hydra goons. Rick tells Steve what Maria told him and Steve convinces Rick to trust him and to send the codes to shut down the Earth Shield. Rick sends it and Black Ant burst in and arrest Rick. A suicide bomber blows up the Shield base camp and it opens the Shield (but really its Steve who opens it, the bomb damage is superficial). Then Steve transmits a message to all Hydra teams that this is the time to attack.
End of Spoilers
Its a good pre-read for SE #0 because it places the charaters in position. Not sure what the benefit of Steves mum is except it gave Steve his confidence back and made him believe, so maybe there is method in Elisas madness.