At 10 months, flashcards can be a nice way to expose her to words and images, though at that age it is really more about the interaction and repetition than any formal learning, so I would not stress too much about getting a specific brand. A friend of mine tried the Glenn Doman-style cards for both English and Mandarin and found them solid for that age, simple bold images with clear text, and said her girl responded well to the daily routine of going through them together. You could also check Popular or MPH for bilingual sets since they usually have a decent range at different price points, and that way you can flip through before buying to see if the font and images suit you.
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