Can anxiety bring delusional thinking and hallucinations?

I myself have anxiety, I understand the physical and mental problems it can cause. I know it can be to the point of, making you paranoid and physically ill etc. However im concerned about a relative. She sits all day smoking cigarettes is very distant withdrawn and behaves abnormally. For example   she constantly talks about  the past and something someone has told her 5 years ago and says  these people who have confided in her with their troubles are trying to bring her down and are selfish to bring their worries to her and keeps saying it over and over that these people have brought worries onto her. She also continues to go on and on about how wonderful her abusive cruel partner is. making up stories about nice things he has done, she even goes to her gp to tell him about how wonderful her partner is. She does not wash often and does not eat if she is not fed and catered for by her son. she sits by the window and claims that the trees spell out words to her. She also says the clouds have made statements about her relationship for example "she doesnt want you near him" "lazy" "cry now" and she is now certain this meant that she is not good enough for her partner and that his mother does not want her to see him, she then told all her relatives that she is not allowed to see her partner because his mother says so as it was written in the sky, she has been in a mental hospital previously however tehy believe she is playing on her illness for some reason. however my partner and i live with her. She is ill to the point where she can not watch tv as she believes the tv can read her mind, picks up on all the nagative words being said and relates them to her issues and believes its directed at her. she has also hallucinated the film characters have turned and pointed their weapons at her. she twists what we say to her unintentionally by saying we said things we did not or thinks we meant something else by what we said entirely. we have a lot of responsibility to look after her and as i am ill myself i am becomign increasingly stressed by it. it is very frustrating as i have called nhs for advice and they seem to fob us off with must be anxiety shes not phsycotic because "she is aware the things she experiences are not normal" however she is not always aware of this she is weak minded and goes by what others tell her and constantly looks for reassurance so i think that because people tell her the things are not real she accepts it. Not always though for example the "written in the skys" and that mother nature has turned against her and theres an outside force making her life worse and bringing on bad luck. her partner has moved away for his job and doesnt want her to live with him so she then believes it is because she needs to tidy and look after things better. however her partner has no concern at all for her wellbeing and himself has mental  and learning difficulties. He is very verbally abusive and nasty and she wont believe anything bad against him if her family say anything negative towards him she becomes extremely defensive and nasty. Recently she has become more irratable and stands at the window waving at the trees. She drives us crazy with questions like "will they get things sorted for us" "will they mnake things better for us" we have no idea who they are. we are always worrying about her mental health and it is getting worse and worse i dont think this type of behaviour is just anxiety and all she gets is diazapam which she does not take. someone please help us find out what to do or whats wrong so we can help her. 

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