Just like few other posters here, I am new to AA awards. Need an advise on the following:

traveling with my grandma on 9/28 CVG-JFK-HEL-SVO. Since she's over 90, I was planning to get us both in Business, but it looks like it was only 1 seat available. I booked her in Business, got me a ticket in Economy. We are in Economy on CVG-JFK, there are Business seats for HEL-SVO part, but not for JFK-HEL part.

What would be your recommendations in the situation? What are the chances another seat in Business would open on Finnair? I'd like to stay as cloase to her as possible... Would Finnair put me in one of the first Economy rows if I called them?

Thanks.