As far as I can tell, she is. As of 2009, her manga Glass Mask is still running. There might be more complete information on Japanese-language sites, but sites in English don't seem to have a death date. She was born in 1951, so unless some tragedy strikes, she probably has plenty of life left.
See the related link below for more.
According to Japanese Wikipedia, http://ja.wikipedia.org/wiki/美内すずえ
still alive.
Born 1951年 Feb 20, age 59 in year 2010
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Yes she is still alive.
Yes he is still alive!
Claes Oldenburg is still alive. he hasn't died he is still alive No, he is alive and kicking.
Yes, she is.
Fortunately he is still alive today and still making his magnificent sculptures.