I would say 30 minutes is way to long to be outside to go potty. Since you just got her you have to train her to go potty outside. To do this I would suggest taking her out when you know she has to go, say first thing in the morning and while she is going potty say "good" and give her a treat. When she is finished have a party like her going outside was the best thing ever. Everytime you go outside take some treats with you when she goes give her a treat and have a party. Be sure to encourge her to "go potty" while you are outside, she won't know what this means at first but eventually will figure it out. After she goes and you are having your party, be sure to say good potty so she figures out that is what you wanted. If after 5 minutes she doesn't go bring her inside. If she goes inside say "opps" and rush her outside and tell her to go potty. If she goes throw a party but no treat. Oh, one more important thing, after she goes potty let her sniff around for 30 seconds to a minute before heading back inside. This way she won't think that as soon as we go potty we go inside and so she won't be tempted to sniff the ground before she does her business because she knows she will get to afterwards. Hope this helps good luck.