Going by this, it seems probable that the "Ms. Steinfeld" the Ms. Marvel credits refer to is indeed Hailee Steinfeld.
Adding to the likelihood of Steinfeld appearing in Ms. Marvel (or the show having some connections to Hawkeye) is the fact that the series' end-credits sequence features a blink-and-you'll-miss-it appearance by Trust A Bro, a moving company operated by the tracksuit mafia that was prominently featured in Hawkeye.
A truck from the company shows up at the 42:22 mark alongside Executive Producer Victoria Alonso's name.
Keep in mind, though, that it's better to have some level of skepticism about this. The Ms. Marvel credit could have ultimately been a mistake that somehow carried over from the Hawkeye-credits layout — however unlikely that may be. Furthermore, a reference to a plot point from Clint Barton's solo adventure doesn't necessarily mean a character from that show will make the jump to Ms. Marvel.
Ms. Marvel is currently streaming on Disney+, with new episodes releasing every Wednesday.
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