Heidi Montag has isolated herself from many of her former Hills friends — and now, it looks like her family is next to go. Instead of greeting her mother, Darlene, when she arrived unannounced at Heidi's LA home on May 13, the reality star called the police to turn her away. The mother-daughter duo famously clashed when the blonde paid a visit to her Colorado hometown after undergoing a shocking 10 plastic surgeries. Heidi, who friends tell In Touch has been acting vacant and strange, also cut ties with her older sibling, Holly. "I don't talk to my sister," Holly recently told In Touch, adding that she also ceased communicating with Heidi's controversial husband, Spencer Pratt. And as In Touch previously reported, Spencer has been more controlling lately than ever. "He's cutting her off from the world," an insider tells In Touch. "It's like he brainwashed her."