How did she have 3 children and die at age 8?

Good point. I suggest that you email the curator :) She's my 19th ggmother or something like that I see. Do you have sources for her?

I see a birth date of 1271 on the Internet (someone's tree) with her husband's birth date of 1267. That would be more likely, although I haven't found a reliable source.

http://en.wikipedia.org/wiki/Arden_family

Ralph de Arden (d. aft. 1290)

Supposedly, the son of Ralph de Arden (? ca 1267) and Alice de Beauchamp (? ca 1271) was born in 1298. No marriage date or location for them BTW.

There's no accurate date for her. There's a bunch of guestimates for Alice de Beauchamp (wife of Ralph Arden). They either say "circa" or "born after" [insert a date after 1270ad].

I removed her death date since there's no reliable source for a death date and most other trees do NOT have a death date listed for her.