I'll probably have to listen on headphones, which I don't have access to right at the moment.
However, seeing the other lyrics and being able to make out the last couple of syllables of the word, my guess is "ascension". Or Ascension, if the songwriter's intent was to make her a Christlike figure, (I'll let the readers decide that). As in:
Now I feel her ascension
For a minute I was in her heaven
I'll listen again on headphones to see if I can hear anything else, but that is what I'm going with now.