My initial thought was "no, that's not her" but I had to do the Astrology to determine really what I thought as Astrology matching is my "go to" yes/no for all things past life "related"
I'm 65 years old and really (yes, I am an old man) wasn't all that familiar with her work and so I looked up her astrology and saw she was born in 2001. My immediate thought was she is the "reincarnation of a very famous musician who DIED in 1998"
I google "musician died 1998" and the first name I see is Frank Sinatra and I look at him and look at her and think "holy fuck"
and then I think, "how likely is it that this young singer is actually Frank Sinatra reborn?" . . . but I did the Astrology and I did a few photo overlays . . . and I am doing this at lightning speed, too
so I will likely add more later
but the Astrology, in my opinion, matches and is, from my way of looking at it, a pretty TIGHT match
The Moon Nodes are often important points in doing the matching between charts when it comes to "confirming" a past life . . . Frank's North Node at 10 Aquarius conjuncts his natal Uranus at 12 Aquarius. This conjunction forms a conjunction with Billie's Moon at 12 Aquarius as well as (with the North Node, anyway) a conjunction with Billie's Neptune (7 Aquarius)
The Moon conjunct one of the Nodes -- that just screams KARMA and add Neptune and Uranus into the mix, which is mathematically significant, since they are "outer planets" and it takes them a while to travel around and get anywhere . . . so Uranus conjunct Neptune here is pretty important, too, I think, in looking at past life "themes"
Both Billie and Frank are Sagittarians, born in the exact same week (only 86 years apart). Billie's natal Sun (26 Sagittarius) makes a tight conjunction with her South Node (27 Sagittarius), which makes a tight trine aspect to Frank's Mars at 27 Leo
Pluto is also usually prominently placed in past life matching . . . Frank's natal Pluto (2 Cancer) opposes Billie's Mercury at 4 Capricorn (Pluto - Mercury . . . a past life "gift" or "challenge" related to communication) and Chiron at 0 Capricorn
BILLIE'S PLUTO at 15 Sagittarius forms a tight conjunction with Frank's Mercury (karmic skills in "communicating") at 17 Sagittarius and Sun at 19 Sagittarius. Frank's Sun makes a tight conjunction with Billie's Venus (20 Sagittarius -- a theme here about how to find, give and receive LOVE)
and these ultra-tight conjunctions just keep piling up, adding (in my opinion) to the possibility that this is really "a match"
Frank's natal Venus is 11 Capricorn . . . this makes a very tight quincunx with Billie's Saturn at 10 Gemin and opposes her natal Jupiter at 12 Cancer (more "stuff" suggesting love is gonna be an "issue" as she makes her way forward as a famous musician) . . . to add to the holy fuckness of this, that Jupiter at 12 Cancer makes a very tight conjunction with Frank's Saturn at 14 Cancer
Frank has a square in his natal chart between Sun/Mercury (19/17 Sagittarius) and Jupiter/Chiron (19/18 Pisces). Jupiter/Chiron also forms a tight square with Billie's Venus (20 Sagittarius) so, it seems to me, that "re-working" how she relates to people is sort of her "let me try again" THEME for this lifetime
Frank's Neptune (2 Leo) makes a quincunx with Billie's Mercury at 4 Capricorn so the natural gift that Frank was blessed with as a singer may "morph" a bit in this go-round as Billie Eilish
and it just continues to go on and on and on
this, already, is (to me) way "more than enough"
I believe Billie Eilish is the reincarnation of Frank Sinatra