In my opinion, you are at the stage where you need to either take her to a vet or take the risk of emptying her crop by inverting her and vomiting her properly. Her crop is clearly so full that there is no room to massage the contents without them coming up, so you need to empty some out so that you have room to manipulate the rest to try to break it down. She is at risk of aspirating anyway, so yopu don't have a lot to lose. I would recommend that you do a search on You Tube for "how to vomit a chicken" and watch several different videos before you attempt it, so that you don't just pick a bad example. Be prepared for her to shake her head and fling vomit about so do it somewhere that is easily cleaned and wear old clothes or an apron or overall. It is best to tip them forwards and slightly to their right so that the oesophagus is very slightly lower than the trachea and vomit drains out of the right side of their mouth. I tend to hold them against my chest and bend forward with them so that we are both upside down and I can monitor her closely for distress and stand back up to give her a breather between bouts of vomiting. You will be unlikely to empty the whole crop.... aim for half but expect less. Once she has emptied some out, then bring her upright and massage.