Diane Savereide is one of the most mysterious persons I've tried to research.

I've come up with so little information, but I feel she needs some sort of recognition, so I'll publish what I've found.

     Diane was born on November 25, 1954. Thanksgiving Day.

She won the US Women's Chess Championship in 1975 and 1976.
In 1977 and 1978, she shared the Championship with Rachel Crotto.
Crotto won it in 1979.

The next Championship was held in 1981 and Savereide regained the title.

She held it until 1986, having only to win it in 1984.

In total, she was the US Women's Champion for 9 years, winning a total of six tournaments.

In the 1988 Olympiads, Diane played on the American team. The American women's team is generally considered weak in the Olympiads, but this particular year they upset the applecart by drawing their match against the Russian team. The really surprising part was that Diane Savereide, the only non-Russian playing on the American team. She was considered possibly the weakest player on the team. But in that match she was the only player to score a win. The win was against Irina Levitina, a former official challenger for the Woman's World Championship and US Women's Champion 1991, 1992, 1993. The game went into a drawish ending that she converted into a win through sheer determination.

While she's not on any current list, to gauge her strength, here's where she would fall today: 
 

February 2004 Top US Women

1 Kosteniuk, Alexandra FL 2573
2 Polgar, Zsuzsa NY 2542
3 Zatonskih, Anna OH 2468
4 Krush, Irina NY 2436
5 Donaldson-Akhmilovskaya, Elena WA 2429
6 Belakovskaia, Anjelina NJ 2375
7 Baginskaite, Camilla CA 2370
8 Shahade, Jennifer NY 2361
9 Fierro, Martha L NY 2355
10 Goletiani, Rusudan NY 2352
11 Abrahamyan, Tatev CA 2332
**  Diane Savereide 2250 **
12 Battsetseg, Tsagaan MD 2238
13 Hahn, Anna NY 2215
14 Morkunaite, Egle CA 2208
15 Marinello, Beatriz FL 2200
16 Epstein, Esther MA 2187
17 Tsai, Cindy J FL 2177
18 Gorlin, Yelena IL 2169
19 Groberman, Elina MA 2164
20 Sagalchik, Olga NY 2157

 
 
Here are two games, one is a win against GM Tony Miles and the other a loss to GM Judit Polgar:

[Event "Malta Olympiad"]
[Site "Malta"]
[Date "1980.??.??"]
[Result "1-0"]
[White "Savereide Diane"]
[Black "Miles Anthony J (ENG)"]
[ECO "B42"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Nc6 6.Be3 Nf6 7.O-O Ne5 8.h3 d5 9.Nc3 dxe4 10.Nxe4 Nd5 11.Bd2 Nxd3 12.cxd3 Be7 13.Qg4 g6 14.Qg3 O-O 15.Bh6 Re8 16.Rac1 Nf6 17.Qe5 Nh5 18.Nf3 f6 19.Qc3 Bd7 20.Qb3 Bc8 21.Nc5 Qd5 22.Qb6 Bd8 23.Qb4 b6 24.Ne4 Bb7 25.Rc4 e5 26.Rd1 Qe6 27.Rdc1 Bd5 28.R4c2 Be7 29.Qd2 Rac8 30.Rxc8 Rxc8 31.Rxc8+ Qxc8 32.Qe3 Qc6 33.b3 Ng7 34.g4 g5 35.h4 Bxe4 36.dxe4 Bc5 37.Qd3 Ne6 38.hxg5 

1-0

[Event "Thessaloniki Olympiad (Women)"]
[Site "Thessaloniki, Greece"]
[Date "1988.11.??"]
[Round "0"]
[White "Polgar,Judit"]
[Black "Savereide,Diane"]
[Result "1-0"]
[Eco "B85"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 Be7 7.0-0 Nc6 8.Be3 0-0 9.f4 Bd7 10.Nb3 a6 11.a4 b6 12.Bf3 Qc7 13.Qe2 Rfd8 14.g4 Be8 15.g5 Nd7 16.Bg2 Nc5 17.Nd4 Nxd4 18.Bxd4 Bc6 19.Qf2 b5 20.axb5 axb5 21.b4 Nd7 22.Rxa8 Rxa8 23.f5 exf5 24.Qxf5 Rf8 25.Nxb5 Bxb5 26.Qxb5 Ne5 27.c3 Bxg5 28.Qd5 g6 29.b5 Bd2 30.Kh1 Qc4 31.Qxd6 

1-0