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In my experience, anyone who is wearing the same color as the bridesmaids is often confused as being a member of the wedding party---once I wore a peach-colored dress to a peach-themed wedding and everyone thought I was a junior bridesmaid! If your soloist sings often at weddings, she probably has an outfit or two in some neutral colors that she uses for such occasions. You might ask her what she's planning to wear, but you can't really ask her to buy something new just to wear for your wedding. Ideally a non-obtrusive color such as taupe or navy blue would be nice, but in the end the choice is up to her.