Jenny has a job, a cat named Joker, and 31 candles on her birthday cake. She is worried about finding the "right" partner. She frequently spends nights alone and knows she is not getting any younger. According to Erik Erikson, Jenny is in the stage of development called:

The stage she is in is called Spinster stage of develpoment.

Explanation:

In the life of an individual, there are various stages of development starting from when an individual was born to his adult stage of development. In the case of Jenny, due to the fact that she has a job, and can afford the things of life but not being married yet, the stage of development she is in is called spinster stage.

At this stage, she is losing her youth and approaching menopause which would increase the difficulty of her concieving a child. Once this stage passes her without getting married she would enter another stage known as menopause stage in development which would leave her with the only options to adopt childrens.