* A car seat or booster seat: A very strong indicator, especially if it's for a younger child.
* Lots of snacks and drinks in the cupholders and backseat: Empty water bottles, half-eaten granola bars, etc.
* A mom-themed air freshener or accessory: Something like a flower-shaped air freshener or a keychain with her kids' names on it.
* A well-organized interior with lots of compartments neatly stocked: Moms are often masters of organization.
* A carpool schedule or notes visible on the dashboard: A clear sign of a busy mom's life.
* A stroller or other baby gear in the trunk or backseat: Again, a strong indication if there are young children in the family.
* Lots of colorful stickers and drawings on the windows or bumper (depending on how old her kids are): Could be from her kids making the car their own, and is typical in families.
The most telling sign would likely be a combination of these things, rather than a single item.
