I would consider that descrimination against children (was she harrassing *you* for touching the toys as an adult?) and inform the store why I wouldn't be shopping there again.
When DD was about 5 she had saved money to buy something at the Hello Kitty Store (Sanrio). She got her item and waited patiently to be helped. The cashier kept helping adults instead. Looking at her and just letting adults go first. After buying her item, DD said her feelings were hurt and we ended up returning the item, explaining why and not shopping there again (at DD's request). I see a lot of situations where kids aren't being held to adult standards (which is one thing) but *above* adult standards and it just ticks me off.