The ending left me confused someone tell me

Yeah it was a very ambiguous film. I was expecting more answers towards the end, but it was up to interpretation. It was basically the same ending as Rosemary's baby, except Shelley grows up to become Hillary Clinton, dohohoho

Didn't they say the wife could not have kids and that she supposedly has something against electricity? Also she did say she had a still born baby and Eliza saw a dead baby in her dream so it could possibly be the stillborn baby that took over.

I assumed that was Elena ghost