How can I stop worrying if my friend is mad at me for not being able to go to her birthday dinner anymore?

So my friend invited me and several guests to a dinner (she chose the place and date of event) and I initially RSVP’d YES. I was so excited and I expected that I’d have to probably pay for my meal and I budgeted accordingly while also getting her a gift. Then last night she tells me over text that there’s a $150 spending MINIMUM per guest at the restaurant! I also have no idea how we’d split up the bill like evenly or not. I don’t drink and expect everyone else will get drinks. I just don’t feel comfortable going anymore. I told her I’ve been sick and haven’t had much appetite past few days and suggested to take her out to lunch next Saturday…I haven’t gotten a response. I am really worried she’s mad at me and I have no idea how to navigate this.

How can I stop worrying if my friend is mad at me for not being able to go to her birthday dinner anymore?
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