There are two sentences.
- She seems crazy.
- It seems like she is crazy.
I don't know the difference between two sentences in meaning. Could you tell me the difference in meaning between two sentences?
Firstly, both sentences are a subjective opinion given by someone, and they have exactly the same meaning. However, the difference lies in the syntax.
She seems crazy
is considered a personal sentence. This means that it is the opinion of the speaker, and the speaker doesn't shy aware from admitting it.
It seems like she is crazy
is an impersonal sentence (See here for more details and examples). This means that, although it is still the speaker's opinion, they are distancing themselves from it, by saying "It seems that" + their opinion. They are trying to make themselves sound more objective or neutral, even when giving an opinion, which is always subjective.
It's very difficult to answer this sort of question because the nuance is almost imperceptible. There is a very slight retreat from assertion in "it seems like".
She seems crazy ~ She is acting crazy.
It seems like she is crazy ~ From her behavior, one would conclude she was crazy.
Like X means:
not actually X, but sharing some or an incomplete amount of the attributes of X
not actually X but you could substitute X for whatever you are talking about.
X can be a word or a phrase. Like X is often used as a crude hack in informal speech when the speaker (hopefully not writer) cannot immediately think of a good word and wants to "adjective-ify" a phrase for use as a subject complement.
She seems crazy
This means from what we can see, we believe her to be crazy.
She seems like she is crazy
This technically means "from what we can see, we believe her to be not actually crazy but sharing some or an incomplete amount of the attributes of 'to be crazy'". So this is a softer way to say she's crazy without directly accusing her of being that way - or we are making a guess based on appearance, someone's description, etc.