One large cricket is not excessive for an adult ghost. Unless the cricket was sick it probably isn't the cause of what's going on.
Being eggbound can be fatal but not always, some females can live out the rest of their natural lives fine, it just depends. I have read that getting them to drink extra water can help lubricate things and encourage laying. Offer her some drops of water and see if she will drink. Ghosts aren't really big drinkers to begin with, they seem to get the majority of fluids from prey so don't panic if she's not interested.
She may not be eggbound, just hesitant to lay. Sometimes the reason a female won't lay is because she is not completely comfortable in her environment, possibly because there isn't enough privacy, space, humidity or suitable laying spots. I see you have her in what looks like a mason jar with a couple sticks. This is probably not ideal. My 2 ghost females refused to lay when I had them in a similar setup in a plastic jar but they began laying almost immediately after putting them in a 12x12x12" terrarium with real plants and lots of thinner sticks. Maybe consider finding her a larger enclosure with lots of area at the top where she can hang from the ceiling/lid. They almost always choose one of the highest places in the enclosure to lay, often on the ceiling itself. Ghosts in particular prefer to lay on sticks about 1/4" in diameter. My pair of females lay the majority of their ooths on the 1/4" wooden dowel rods I used to secure fiberglass window screen to the lid of their terrarium, the dowels are on the ceiling & run parallel to the ground. Also including real or fake plants for added privacy may help as well as blocking off 3 sides of her enclosure with posterboard or something to block the view. Another thing is humidity, you can increase misting to as much as twice a day if necessary.
