I read your lambing thread from last year. You definitely have a wool breed – from the heavy fleece and the horns some type of Merino cross perhaps. Most wool breeds are seasonal breeders. That means that the breeding season is based on daylight hours. The ewes will start to cycle as the daylight hours decrease and temperatures cool down. Seasonal breeding mature rams can be affected by heat – when the temperatures are extremely hot, they can become temporarily sterile.
It looks like you are in Ecuador, right?
Eduador is one of the southern hemisphere countries where summer and winter seasons are reversed. Your winter is June through September while your summer months are October to May.
Here in the northern hemisphere, our seasonal breeding sheep breed between September and January, in the fall when the days begin to get shorter and cooler, and lamb in the spring as the days get longer and warmer.
Since you are in the southern hemisphere, your fall season (and shortening daylight hours) will be between May and October. If your sheep are seasonal breeders, you can expect your ewe to start cycling in May, and breed between May and October. That means that your lambs would normally be born between October and February. Possibly even as late as March. Since you purchased your lambs in June at approximately 3 months old, they could have been born in late February/early March, at the very end of the lambing season.
Your first lamb was born in May 2019. This would have been out of season for your climate and the beginning of the breeding season. Since the ewe had just lambed in May, she would not have come back into heat during that breeding season. She would not have cycled again until this year at the normal breeding time.
Now that the ewe is mature, she has adjusted her metabolism to a daylight hour cycle. Her 8 months old lamb should be cycling this year as well, although some ewe lambs do not produce their first lambs until they are between 12 and 18 months old, depending on when they were born, time of the year, size and breed, etc.
If your ewe is cycling now, according to daylight hour length in the southern hemisphere, you should watch the ewe and lamb to see if the ram is interested in eiher at different times of the month. Sheep usually cycle every 14-17 days. Her vulva might appear slightly redder and swollen at that time indicating estrus. In that case both the ewe and her lamb could cycle and be bred for lambs to arrive between October 2020 and May of 2021.
If the ram was rough with the ewe when trying to breed, he could have caused a slight tear or scrape on the vulva, especially if she was not willing to stand for him. He has horns and could have accidently caught her with one.
What months do you usually see young lambs offered for sale in the market? This will give you an idea of when the normal lambing season occurs in your area. If no young lambs are being sold right now, then it is probably not normal lambing season.
Some kind of wool breed. I haven't figured out if she is a seasonal breeder or not yet. I would venture to say no only because she was born around Feb - Mar and she lambed in October. 
