Hello, I'm Dr. Deb. I'll do my best to help you today.
I'm sorry for this concern for Candy.
It's certainly possible that either the bike ride or injury sustained from hitting the wall could explain her behavior
soreness secondary to sprains/strains or pulled muscles/ligaments are common causes of lameness
in our dogs especially if they overdo it.
Of course, there could be other possible explanations as well such as tick bourne diseases or even Leptospirosis (if present where you live).
But, if her temperature is normal (between 100 and 102.5) and she's eating and drinking, then these other conditions are less likely.
Problems with her spine could also affect two legs at one time which might be a more serious issue although it would take an MRI to definitely diagnose such a problem.
If she's not vomiting nor currently taking any steroid or non-steroidal anti-inflammatory medication, then over the counter Aspirin can be given at a dose of 10 mg per pound of body weight twice a day with food to avoid stomach
This drug not only has anti-inflammatory properties but anti-pain ones as well which may be of benefit.
My only hesitation about its use would be that it might interfere with what your vet would want to prescribe if she has to be seen.
In most cases, dogs with soft tissue injuries will start to show improvement within a short period of time; however, if she continues to struggle to walk and/or she's running a fever and/or she doesn't want to eat, then a vet visit may be prudent.
I hope this helps. Deb