Is this euthanasia?

My mother in law is at the end of her life (99+ years old). Her body has pretty much shut down. She has congestive heart failure, a pacemaker, and leaking heart valves. She is unresponsive and has been declining for several weeks. Cannot take liquids or food of any kind. The nursing home has started giving her morphine for her pain. Cannot take an IV at this stage, because kidneys have failed. The gist of the conversation this evening was that the medical professionals will give her increasing doses of morphine as pain management tool. Eventually, this increased dosage will suppress her respiration, and she will die from the morphine. Is this morally acceptable? Is this in a broad form euthanasia?

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