Measure her temperature first.

Many dogs face this problem of depression after grooming, you can calm her by giving Vivaldis anti-calming powder or make her feel comfortable.

"The best cure for loneliness is companionship. Spend extra time with your Dog. Take Them Out For Some Exercise. Reward Positive Behavior. Socialize With Other Pets." {There are many factors that can impact on a dog's emotional state – these include changes to routine, environment, social group, or as a result of chronic stress or anxiety resulting from fears and phobias or lifestyle. Common symptoms include low activity levels, a loss in interest in the things they once enjoyed, and a change in eating and/or sleeping habits.}

First of all measure its temperature.

measure temperature many dog face this after grooming but my shihtzu is ok now

Try spending some time around her. Feed her treats that she loves! Assure her you're with her and love her.