Need some advice -- baby related....?

Well the pebbles will certainly create a problem (curious little mouth) but I wouldnt make the decision on the house based on this. If worse comes to worse, just dont let your daughter crawl outside, only let her do so in the house. Another thing you can do is lay huge blakets out each time you let her down to play... keep the pebbles off the blankets and watch her closely to make sure she doesnt go to the edge and put some in her mouth.