I do think your sister is right. You need to build up a customer base first before you can do anything about your prices. The best customer base, of course, comes through word of mouth. These will also be the people who remain loyal to you in the future, even if the price goes up. There’s a good chance that, if the price she’s asking is too low, she’ll naturally have to top it up, and that’s not the idea. I think what you’re showing looks absolutely lovely and appetising, and I hope your sister builds a brilliant business. Another thing she could do is raise the price slightly and, for example, give something away for free, or offer a discount if people order more. Lots of people would be happy with that too, and it also ensures satisfied customers and customer loyalty.