If it is small enough, just empty it and turn it over or on something to dry until the next time.
I also would recommend this being your dd is 13 months for two reasons; don't keep it out and she can't get into it on accident and she is still in the diaper stage.
When we had one, it was too big to flip over. I brushed it with a scrub brush to keep any ick from forming on the bottom and sides and also from making it slippery before I emptied the water; every 2 or 3 days depending on use or weather, by standing on the side and letting the water out. Any more days that that and it you risk stagnant water. Fresh water, fresh chlorine. It was a kiddie pool, not one of those instant up things now and my ds was older and not in diapers, why the bigger pool. The infant pools are small and so just dump them out.
Now if you think something is in the pool already, I would either get a new pool, use clorox spray, or simply let the sun sterilize it, if it can shine on all parts of the pool, no hidden creases or such. Myself, I would just get a new one to be safe.
Now with that said, also practice good pool hygiene. If there has been a bm before swimming, give them a bath or shower off before going swimming...Don't let animals in the pool...hang bathingsuits to dry and keep them clean..don't go in a pool with an open cut and if you get one, put antibiotic ointment or such on it.
Updated...sorry, I forgot about waterproof bandaids