She just wants to be friends should I ignore her

"Just friends" can mean a clean no, or it can mean she likes you and doesn't want to hurt you. The words alone won't settle it. Look at how she frames it. If she gives a reason that is about timing, location, or where she is in life, she may be leaving a small door open. If she gives a reason that is about you, or she says she doesn't feel attraction, that's a closed door. Her tone also helps. Warm and specific usually means she values you and wants to keep talking. Short and vague usually means she wants distance. Her message is the only data you have, so treat it as a complete answer. Don't go looking for a hidden yes in it. Most people who say this have already decided, and the rest of the conversation is about how kind the ending is.

A reply that works here has three parts. It accepts her answer in plain words, it thanks her for being direct, and it lets her off the hook for the next move. Leave out anything that asks her to reconsider, anything that explains your feelings in detail, and any joke that softens the no into a maybe. The reply is for her, so keep it about what she needs to hear. If you find yourself drafting a second paragraph, delete it. A reply that stops early reads as respect. One that keeps going reads as a bid to keep the conversation about you.

After your reply, give it a real gap before you message again. A few days is usually enough to show you're not chasing. If she replies warmly, match her energy and let the friendship take its own shape. Keep the first few messages light and about things outside the dating context. If she goes quiet, that's an answer too, so don't send follow-ups asking if she's okay or whether she's still mad. One message after a long silence, if you want to send one, should be a simple check-in with no pressure. If you still get nothing, stop there. Sending a third text to a silent person is the point where a respectful ending turns into an uncomfortable one.