Though Liza did meet with Hugh Jackman when he was prepping for THE BOY FROM OZ, Jackman and the media did report that she politely stated that she was not going to see THE BOY FROM OZ.
Saying this, I think it is safe to assume that Ms. Minnelli will not being seeing END OF THE RAINBOW. Not now; not ever.
The ABC TV mini-series LIFE WITH JUDY GARLAND: ME AND MY SHADOWS is a completely different scenario as it is (and was) a joint family project. Her sister Lorna Luft not only wrote the book the film was based on, but also produced the television adaptation, etc. Liza was very much involved with the project in some form or another.