From the passage, you can infer that:

The most suitable inference is that Omelia is disappointed that she can't find something to wear for her own dinner party. This conclusion can be drawn if the passage presents Omelia in a situation where she is preparing for a significant event, such as a dinner party, and expresses feelings of dissatisfaction or disappointment regarding her wardrobe choices.

The mention of her own dinner party indicates that this is an important occasion for her, which amplifies the emotional stakes surrounding her outfit selection. If the passage includes details about her searching for suitable attire specifically for this event, it reinforces the idea that her disappointment stems from the inability to find something appropriate to wear.

The other options, while highlighting different emotions or situations, do not align as closely with the specific context of her preparing for her own dinner party. Therefore, they do not reflect the primary focus of her feelings as described in the passage.