Final answer:
Sondra Celli is advised to use a niche marketing strategy to effectively target and serve the specific market segment of Romanian gypsy women in her area.
Step-by-step explanation:
Sondra Celli should implement a niche marketing strategy to target Romanian gypsy women in southern Indiana seeking elaborate dresses for weddings and birthday parties. Niche marketing focuses on a specific segment of the market with unique needs, which allows for a more tailored and effective marketing approach. Through niche marketing, Sondra can concentrate her resources on a clearly defined group whose needs she knows well and can service uniquely. Her intricate and culturally relevant dresses serve as an advantage in meeting the needs of these specific customers.