Personal Questions

Uhg,so today a random lady was standing behind me in line and she commented on how cute my daughter was. She then asks if my daughters the only child. I said yes. She then proceeds to tell me that each child deserves a sibling and that I shouldn't wait any longer since my daughter is 8. Although she doesn't mean to be hurtful and pry, she is. Husband and I have been struggling for #2 for 7yrs now. Granted,I don't expect her to know that but should people have such personal random conversations and not knowing the reason? I'm sure I'm being too sensitive though. How do u all fell about people asking "when do u plan on having kids" or "Why did u just stop at one?"