Breakdown of Сначала и она казалась виновной, но позже стало ясно, что она тоже невиновна.
Questions & Answers about Сначала и она казалась виновной, но позже стало ясно, что она тоже невиновна.
Here и does not mean the conjunction and. It is a particle meaning also / too / even.
So и она means something like:
- she too
- even she
The idea is that she is being added to some previously mentioned group: others seemed guilty, and she did too.
Because и stands directly before она, it strongly highlights она.
Казалась is the past tense, singular, feminine form of казаться = to seem / to appear.
Why feminine? Because the subject is она, and in the past tense Russian singular verbs agree with gender:
- он казался
- она казалась
- оно казалось
The -сь is the reflexive ending, but with казаться it is just part of the normal dictionary form of the verb.