Toddlers problem. What shall i do?

My daughter is 18 months old and from past few days she is having problem in toddlers. She used to do it properly every day but now days (this week ) she is giving a gap of 3 to 4 days and she is passing it very tight .. sometimes i see trace amount of blood also. She is not on diapers i take her to wash room and try to make her do every day. but from past one week i m struggling badly. my first question is - its summer now she eats less solid food and more liquid so is it ok if she gives a gap of 2- 3 days for toddlers and my second question is as her toddlers are tight, she also try to avoid to do it. what shall i do? pls help me (in a day she eat one slice of bread butter, watermelon , lemon juice, cow milk , 5-6 spoons of rice or 5-6 bits of chappaties, biscuits , mixture,chocolate, ice-cream (chocolate ice-cream are sometime not always). Please suggest me what shall i do.