Is our 'Umrah valid or not, if the circumambulation (Tawaf) did not start and end from the line due to the presence of a small girl who exhausted us, and amidst the crowdedness of Makkah on the 27th of Ramadan, and we did not repeat the Tawaf?

The circumambulation (tawaf) for one who started after the Black Stone invalidates their first circuit, and they are required to perform a substitute for it. If they do not perform a substitute for it and a long time passes, the tawaf becomes void and must be repeated. The umrah is not complete, and the questioners must refrain from the prohibitions of ihram, then proceed to Makkah to repeat the tawaf and sai. Any prohibitions they committed during this period are pardoned due to their ignorance of the legal ruling. If they are unable to go to Makkah, they are considered to be prevented (muhsar), and they may exit ihram by offering a sacrifice or by fasting ten days if they are unable to offer a sacrifice.