If you mean "senior" as in "a senior in high school", it is "estudiante de último año". It is pronounced "eh-stew-dee-AHN-tay day OOL-tee-mow AHN-yo". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
The question needs to be more specific to be answered properly.
I would say the best thing you can do is help her get in a community in which she can meet other seniors. Perhaps, attend some local senior center meetings to make her comfortable at first and then once you leave she will have fun with other seniors.
Sister in law in Spanish is cunada.
How to say "hi" in spanish is Hola. How to say "bye" in spanish is Adios.
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I wouldn't say there is discrimination, perhaps intimidation and uncertainty in the seniors. The rate of scholarships awarded is nothing to imply that there is discrimination, however it varies.
To say 'knives' in Spanish, you would say 'cuchillos.'