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Hello. Thanks for the question.
It sounds like she may have eaten some plant material or soil. This would explain the black dots and the dry consistency of the stools. It can also be irritating to the lining of the colon and rectum, leading to the blood streaking and straining. Straining is often times due to irritation of the lining of the colon and the urge to go, even though there may not be much in there.
To help with these signs, I like to give some canned pumpkin- 1-2 tablespoons 2-3 times daily. This is a good source of fiber to normalize the colon motility and to cushion the walls of the colon and rectum.
I hope this helps, let me know if you have any other questions.