While alive, she was in love with Jonas. Angelica and Jonas belonged to the same cluster. Jonas tells Will he fell in love with Angelica when their eyes first met. He recalls Angelica believed sensates experience love in its purest form.
In Death Doesn't Let You Say Goodbye, Yrsa revealed that Angelica and Jonas Maliki were working together birthing clusters for Whispers. These clusters would be used to hunt other clusters by tracking their psycellium link.
However, it is unclear Angelica and Jonas' aims as in the end, Angelica committed suicide to protect the August 8 cluster.