Michael Schumacher's daughter Gina recently posted a cryptic message, which many believe was aimed at the struggle of her father fighting to recover from his skiing accident nearly four years ago.

Gina took to her Instagram account to post a photo of nature, with the message: "There is only one happiness in this live, to love and be loved #naturephotography #natureforsoul #keepfighting." Gina, who is a talented equestrian, reignited hopes for her father's recovery by posting the heartfelt appeal alongside the photo of a tranquil lake taken while sitting on a horse.

Seven-time world champion Schumacher spent six months in an induced coma after falling and hitting a rock while skiing in the French Alps in December 2013.

Schumacher returned to his home on the shore of Lake Geneva in Switzerland in September 2016, and since then the family has maintained a strict guard on his privacy and little was made public about his health condition.

Reports surfaced in 2014 that Schumacher was paralyzed and wheelchair-bound while suffering from speech and memory problems.

The recent reports claimed Schumacher was getting better with medications and therapies, but his exact condition following the brain injury remains unknown.

Last year, manager Sabine Kehm, who throughout has been responsible for speaking on behalf of Schumacher’s wife, Corinna, made clear their decision of keeping his health details private will not change any time soon.

Schumacher retired from racing for the second time in 2012, after a disappointing comeback in 2010 when he drove for three seasons for Mercedes. He first retired in 2006 after winning five straight titles with Ferrari, following two earlier ones with Benetton.

In July, RM Sotheby’s auctioned off a Formula 1 Ferrari driven by Schumacher. The Ferrari F2001 was driven by Schumacher in 2001 as he won a fifth Monaco Grand Prix, the 2001 Formula One World Drivers' Championship (WDC) and secured Ferrari the 2001 Constructors’ and Drivers’ Championship.