'I don't know what to say right now.
"I feel like he has the right to do whatever he wants to do", said Williams, a seven-time Wimbledon champion.
Having missed Wimbledon a year ago while she prepared to have her first child in September, Serena is in pole position to win her first Grand Slam crown since becoming a mother.
Williams had made a tentative return to action following complications during daughter Olympia's birth, struggling in her few appearances before pulling out midway through the recent French Open with a pectoral injury.
Garbine Muguruza arrived at the All England Club as the defending champion but was knocked out in the second round, while fellow leading contenders Caroline Wozniacki and Petra Kvitova also suffered premature exits. Williams is the only remaining American in the women's singles bracket.
It is the third time Kerber has reached the last four at Wimbledon, where she was runner-up in 2016.
Drake distracted Wimbledon viewers on Tuesday as he turned up to support Serena Williams as she battled it out on Centre Court. "It was really ridiculous for me". The last time two German women reached any Grand Slam semifinals was at the 1993 French Open, featuring Steffi Graf and Anke Huber.
Her loss marks the first time in the Open era that any major has featured a quarterfinal round without a top-10 seed on either the men's or women's side, according to ESPN Stats & Information.
Williams has won her first five matches against unseeded opponents.
"I didn't quite take my chances in the first set but tried to stay calm and keep working for the points", added Goerges.
After clinching the win, Goerges did not celebrate at first, preferring instead to show sympathy with her beaten friend, embracing her with a long hug at the net.
Goerges' win kept alive the possibility of Wimbledon staging an all-German women's final on Saturday as twice major victor Angelique Kerber takes on Latvia's Jelena Ostapenko in the other semi. If she missed her first serve, she'd simply blast another first serve with all her might, rather than a high-percentage second serve, and not worry about double-faulting. "I'm fighting to the end and it helps me, gives me more confidence", said the youngest player left in the draw.