They seem to outgrow the gravel but I have plenty of experience with pine needles and they break down rapidly and will create quite the mess in your gravel. Personally I would supervise her and just get her trough this stage.
NAPWDA Certified Cadaver Dog
Waiting at the Bridge (italics
=GSDs) (hemangiosarcoma=blue):Grim , Cyra, Toby
, Rainbow, Linus, Oscar
, Arlo & Waggles