Is my friend toxic?

We've joined a research lab in July. I met her at the day of our admission and since we are residential scholars all the first year female scholars live in the same apartment (it's a fully funded program and our accommodation costs little to nothing). We both come from the same place and hence speak the same language (that's one reason we became friends). However, I'm noticing nowadays that she has a very weird habit. So, I'm trilingual and don't have any problem speaking English while she can't speak English. Now, whenever we're together and someone speaks to us in English, I usually respond and do the communication on the behalf of both of us. Later, I realized that she usually asks other people about those conversations to understand whether I understood and spoke the correct English. I asked her why she does it and she said: "you know, we're both from rural areas and we don't know English. It's better if I confirm the same with others." This surprises me, mostly because I'm conducting my research on a topic that requires me to have a strong grip of English and I have in fact a postgraduate degree in English Literature. This is just one part of the problem. In every other things she is insecure at, she drags me. For example, she's insecure of her height so she keeps on suggesting that we are insecure of our heights although I'm 6-7 inches taller than her. Every day she comes to me and tells me that since we're from a rural area, people hate us and that our colleagues and seniors at the lab make fun of us. Those people are absolutely normal around me. I have certain insecurities as well but I don't drag her. Is this a sign of toxic friendship?

Is my friend toxic?
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